SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				$ 512,140
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				152,834
Buildings & Improvements				1,330,889
Costs capitalized subsequent to acquisition				197,517
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				175,438
Buildings & Improvements				1,505,802
Total	$ 1,681,240			1,681,240
Accumulated Depreciation	(311,324)	$ (255,599)	$ (237,859)	(311,324)	$ (255,599)	$ (237,859)	$ (212,826)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Write down of asset and accumulated depreciation on impaired assets	(8,597)	(7,144)	0
Other	(74)	0	0
Balance at close of year	1,681,240
Total real estate investments				1,380,245	1,121,385
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	311,324	255,599	237,859	311,324	255,599	237,859	212,826
Additions during year [Abstract]
Provisions for depreciation	78,785	42,960	37,846
Deductions during year [Abstract]
Accumulated depreciation on real estate sold or classified as held for sale	(11,033)	(14,687)	(9,957)
Write down of asset and accumulated depreciation on impaired assets	(8,597)	(7,144)	0
Other	(3,430)	(3,389)	(2,856)
Balance at close of year	311,324	255,599	237,859
Net basis of real estate investments for federal income tax purposes				1,500,000	1,400,000	1,600,000
Unimproved Land [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				10,427
Buildings & Improvements				0
Costs capitalized subsequent to acquisition				1,049
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				11,476
Buildings & Improvements				0
Total	18,455	20,939	25,827	11,476	18,455	20,939	25,827
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	18,455	20,939	25,827
Improvements and Other	0	1,024	205
Cost of real estate sold	(1,000)	0	(442)
Impairment charge	(2,617)	(3,508)	(1,285)
Transfers	(3,288)	0	(1,632)
Development placed in service	0	0	(1,734)
Balance at close of year	11,476	18,455	20,939
Total real estate investments				1,369,916	1,121,385	1,204,654
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	0
Unimproved Land [Member] | Renaissance Heights - Williston, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				750
Buildings & Improvements				0
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				750
Buildings & Improvements				0
Total	750			750
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	750
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	0
Unimproved Land [Member] | Badger Hills - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,050
Buildings & Improvements				0
Costs capitalized subsequent to acquisition				354
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,404
Buildings & Improvements				0
Total	1,404			1,404
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	1,404
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	0
Unimproved Land [Member] | Creekside Crossing - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				3,577
Buildings & Improvements				0
Costs capitalized subsequent to acquisition				693
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				4,270
Buildings & Improvements				0
Total	4,270			4,270
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	4,270
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	0
Unimproved Land [Member] | Grand Forks Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				2,798
Buildings & Improvements				0
Costs capitalized subsequent to acquisition				2
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,800
Buildings & Improvements				0
Total	2,800			2,800
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,800
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	0
Unimproved Land [Member] | Minot 1525 24th Ave SW - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				506
Buildings & Improvements				0
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				506
Buildings & Improvements				0
Total	506			506
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	506
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	0
Unimproved Land [Member] | Rapid City Unimproved- Rapid City, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,376
Buildings & Improvements				0
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,376
Buildings & Improvements				0
Total	1,376			1,376
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	1,376
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	0
Unimproved Land [Member] | Weston - Weston, WI [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				370
Buildings & Improvements				0
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				370
Buildings & Improvements				0
Total	370			370
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	370
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	0
Wholly Owned Properties [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Total	1,358,529	1,369,893	1,090,362	1,669,764	1,358,529	1,369,893	1,090,362
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	1,358,529	1,369,893	1,090,362
Improvements and Other	15,065	34,761	31,007
Total Additions	1,742,926	1,466,219	1,406,449
Cost of real estate sold	(46,001)	(21,601)	(1,305)
Impairment charge	(15,192)	(51,401)	0
Write down of asset and accumulated depreciation on impaired assets	(8,597)	(7,144)	0
Transfers	0	(24,156)	(26,373)
Other	(3,372)	(3,388)	(8,878)
Balance at close of year	1,669,764	1,358,529	1,369,893
Deductions during year [Abstract]
Write down of asset and accumulated depreciation on impaired assets	(8,597)	(7,144)	0
Development in Progress [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Total	0	51,681	153,994	0	0	$ 51,681	$ 153,994
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	0	51,681	153,994
Improvements and Other	0	7,762	48,109
Transfers	0	0	1,734
Development placed in service	0	(59,443)	(152,156)
Balance at close of year	0	0	51,681
Multi-Family Residential [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				505,618
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				135,906
Buildings & Improvements				1,289,330
Costs capitalized subsequent to acquisition				181,185
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				157,150
Buildings & Improvements				1,449,271
Total	1,606,421			1,606,421
Accumulated Depreciation	(294,477)			(294,477)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	1,606,421
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	294,477			294,477
Deductions during year [Abstract]
Balance at close of year	294,477
Multi-Family Residential [Member] | 71 France - Edina, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				56,000
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				4,721
Buildings & Improvements				61,762
Costs capitalized subsequent to acquisition				62
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				4,721
Buildings & Improvements				61,824
Total	66,545			66,545
Accumulated Depreciation	(5,731)			(5,731)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	66,545
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	5,731			5,731
Deductions during year [Abstract]
Balance at close of year	$ 5,731
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Alps Park - Rapid City, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,618
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				287
Buildings & Improvements				5,551
Costs capitalized subsequent to acquisition				356
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				333
Buildings & Improvements				5,861
Total	$ 6,194			6,194
Accumulated Depreciation	(898)			(898)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,194
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	898			898
Deductions during year [Abstract]
Balance at close of year	$ 898
Multi-Family Residential [Member] | Alps Park - Rapid City, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Alps Park - Rapid City, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Arbors - S Sioux City, NE [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,562
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				350
Buildings & Improvements				6,625
Costs capitalized subsequent to acquisition				2,375
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,048
Buildings & Improvements				8,302
Total	$ 9,350			9,350
Accumulated Depreciation	(2,966)			(2,966)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,350
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,966			2,966
Deductions during year [Abstract]
Balance at close of year	$ 2,966
Multi-Family Residential [Member] | Arbors - S Sioux City, NE [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Arbors - S Sioux City, NE [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				2,088
Buildings & Improvements				31,036
Costs capitalized subsequent to acquisition				98
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,089
Buildings & Improvements				31,133
Total	$ 33,222			33,222
Accumulated Depreciation	(4,177)			(4,177)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	33,222
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,177			4,177
Deductions during year [Abstract]
Balance at close of year	$ 4,177
Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				5,193
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				741
Buildings & Improvements				7,569
Costs capitalized subsequent to acquisition				268
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				795
Buildings & Improvements				7,783
Total	$ 8,578			8,578
Accumulated Depreciation	(1,492)			(1,492)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,578
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,492			1,492
Deductions during year [Abstract]
Balance at close of year	$ 1,492
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Avalon Cove - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,616
Buildings & Improvements				34,074
Costs capitalized subsequent to acquisition				275
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,629
Buildings & Improvements				34,336
Total	$ 35,965			35,965
Accumulated Depreciation	(2,354)			(2,354)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	35,965
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,354			2,354
Deductions during year [Abstract]
Balance at close of year	$ 2,354
Multi-Family Residential [Member] | Avalon Cove - Rochester, MN | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Avalon Cove - Rochester, MN | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,067
Buildings & Improvements				5,498
Costs capitalized subsequent to acquisition				3,003
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,503
Buildings & Improvements				8,065
Total	$ 9,568			9,568
Accumulated Depreciation	(3,290)			(3,290)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,568
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,290			3,290
Deductions during year [Abstract]
Balance at close of year	$ 3,290
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				4,920
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				509
Buildings & Improvements				6,698
Costs capitalized subsequent to acquisition				1,885
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				874
Buildings & Improvements				8,218
Total	$ 9,092			9,092
Accumulated Depreciation	(3,144)			(3,144)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,092
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,144			3,144
Deductions during year [Abstract]
Balance at close of year	$ 3,144
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				2,677
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				305
Buildings & Improvements				3,958
Costs capitalized subsequent to acquisition				2,130
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				397
Buildings & Improvements				5,996
Total	$ 6,393			6,393
Accumulated Depreciation	(2,555)			(2,555)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,393
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,555			2,555
Deductions during year [Abstract]
Balance at close of year	$ 2,555
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Cardinal Point - Grand Forks, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,600
Buildings & Improvements				33,400
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,600
Buildings & Improvements				33,400
Total	$ 35,000			35,000
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	35,000
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	$ 0
Multi-Family Residential [Member] | Cardinal Point - Grand Forks, ND | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Cardinal Point - Grand Forks, ND | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Cascade Shores - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				11,400
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,585
Buildings & Improvements				16,710
Costs capitalized subsequent to acquisition				66
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,586
Buildings & Improvements				16,775
Total	$ 18,361			18,361
Accumulated Depreciation	(1,196)			(1,196)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	18,361
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,196			1,196
Deductions during year [Abstract]
Balance at close of year	$ 1,196
Multi-Family Residential [Member] | Cascade Shores - Rochester, MN | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Cascade Shores - Rochester, MN | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				6,222
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				736
Buildings & Improvements				4,864
Costs capitalized subsequent to acquisition				2,359
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,022
Buildings & Improvements				6,937
Total	$ 7,959			7,959
Accumulated Depreciation	(3,587)			(3,587)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,959
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,587			3,587
Deductions during year [Abstract]
Balance at close of year	$ 3,587
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Chateau I & II - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				301
Buildings & Improvements				20,058
Costs capitalized subsequent to acquisition				880
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				322
Buildings & Improvements				20,917
Total	$ 21,239			21,239
Accumulated Depreciation	(3,216)			(3,216)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	21,239
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,216			3,216
Deductions during year [Abstract]
Balance at close of year	$ 3,216
Multi-Family Residential [Member] | Chateau I & II - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Chateau I & II - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				4,470
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				706
Buildings & Improvements				9,588
Costs capitalized subsequent to acquisition				4,700
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,494
Buildings & Improvements				13,500
Total	$ 14,994			14,994
Accumulated Depreciation	(6,287)			(6,287)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	14,994
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	6,287			6,287
Deductions during year [Abstract]
Balance at close of year	$ 6,287
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				2,401
Buildings & Improvements				11,515
Costs capitalized subsequent to acquisition				9,090
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,906
Buildings & Improvements				20,100
Total	$ 23,006			23,006
Accumulated Depreciation	(8,380)			(8,380)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	23,006
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	8,380			8,380
Deductions during year [Abstract]
Balance at close of year	$ 8,380
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Colony - Lincoln, NE [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				12,453
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,515
Buildings & Improvements				15,730
Costs capitalized subsequent to acquisition				1,428
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,708
Buildings & Improvements				16,965
Total	$ 18,673			18,673
Accumulated Depreciation	(3,197)			(3,197)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	18,673
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,197			3,197
Deductions during year [Abstract]
Balance at close of year	$ 3,197
Multi-Family Residential [Member] | Colony - Lincoln, NE [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Colony - Lincoln, NE [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				26,094
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				5,945
Buildings & Improvements				47,512
Costs capitalized subsequent to acquisition				1,136
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				6,268
Buildings & Improvements				48,325
Total	$ 54,593			54,593
Accumulated Depreciation	(7,026)			(7,026)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	54,593
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	7,026			7,026
Deductions during year [Abstract]
Balance at close of year	$ 7,026
Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,387
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				968
Buildings & Improvements				3,762
Costs capitalized subsequent to acquisition				597
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,072
Buildings & Improvements				4,255
Total	$ 5,327			5,327
Accumulated Depreciation	(813)			(813)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,327
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	813			813
Deductions during year [Abstract]
Balance at close of year	$ 813
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				14,848
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,056
Buildings & Improvements				17,372
Costs capitalized subsequent to acquisition				5,411
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,597
Buildings & Improvements				22,242
Total	$ 23,839			23,839
Accumulated Depreciation	(9,318)			(9,318)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	23,839
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	9,318			9,318
Deductions during year [Abstract]
Balance at close of year	$ 9,318
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				6,161
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				491
Buildings & Improvements				7,809
Costs capitalized subsequent to acquisition				1,736
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				569
Buildings & Improvements				9,467
Total	$ 10,036			10,036
Accumulated Depreciation	(4,834)			(4,834)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	10,036
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,834			4,834
Deductions during year [Abstract]
Balance at close of year	$ 4,834
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Crestview - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,576
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				235
Buildings & Improvements				4,290
Costs capitalized subsequent to acquisition				2,206
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				600
Buildings & Improvements				6,131
Total	$ 6,731			6,731
Accumulated Depreciation	(3,737)			(3,737)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,731
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,737			3,737
Deductions during year [Abstract]
Balance at close of year	$ 3,737
Multi-Family Residential [Member] | Crestview - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Crestview - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				7,614
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				620
Buildings & Improvements				9,956
Costs capitalized subsequent to acquisition				3,742
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,148
Buildings & Improvements				13,170
Total	$ 14,318			14,318
Accumulated Depreciation	(6,016)			(6,016)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	14,318
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	6,016			6,016
Deductions during year [Abstract]
Balance at close of year	$ 6,016
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Crystal Bay - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				433
Buildings & Improvements				11,425
Costs capitalized subsequent to acquisition				224
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				436
Buildings & Improvements				11,646
Total	$ 12,082			12,082
Accumulated Depreciation	(780)			(780)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	12,082
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	780			780
Deductions during year [Abstract]
Balance at close of year	$ 780
Multi-Family Residential [Member] | Crystal Bay - Rochester, MN | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Crystal Bay - Rochester, MN | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				12,400
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,583
Buildings & Improvements				18,879
Costs capitalized subsequent to acquisition				222
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,607
Buildings & Improvements				19,077
Total	$ 20,684			20,684
Accumulated Depreciation	(2,857)			(2,857)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	20,684
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,857			2,857
Deductions during year [Abstract]
Balance at close of year	$ 2,857
Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Dakota Commons - Williston, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				823
Buildings & Improvements				3,210
Costs capitalized subsequent to acquisition				24
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				823
Buildings & Improvements				3,234
Total	$ 4,057			4,057
Accumulated Depreciation	(169)			(169)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	4,057
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	169			169
Deductions during year [Abstract]
Balance at close of year	$ 169
Multi-Family Residential [Member] | Dakota Commons - Williston, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Dakota Commons - Williston, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Deer Ridge - Jamestown, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				11,201
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				711
Buildings & Improvements				24,129
Costs capitalized subsequent to acquisition				175
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				733
Buildings & Improvements				24,282
Total	$ 25,015			25,015
Accumulated Depreciation	(2,642)			(2,642)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	25,015
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,642			2,642
Deductions during year [Abstract]
Balance at close of year	$ 2,642
Multi-Family Residential [Member] | Deer Ridge - Jamestown, ND | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Deer Ridge - Jamestown, ND | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Dylan - Denver Co [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				12,155
Buildings & Improvements				77,216
Costs capitalized subsequent to acquisition				158
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				12,155
Buildings & Improvements				77,374
Total	$ 89,529			89,529
Accumulated Depreciation	(1,184)			(1,184)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	89,529
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,184			1,184
Deductions during year [Abstract]
Balance at close of year	$ 1,184
Multi-Family Residential [Member] | Dylan - Denver Co [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Dylan - Denver Co [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				1,874
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,129
Buildings & Improvements				5,524
Costs capitalized subsequent to acquisition				364
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,141
Buildings & Improvements				5,876
Total	$ 7,017			7,017
Accumulated Depreciation	(1,361)			(1,361)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,017
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,361			1,361
Deductions during year [Abstract]
Balance at close of year	$ 1,361
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				7,119
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				810
Buildings & Improvements				5,579
Costs capitalized subsequent to acquisition				8,203
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,459
Buildings & Improvements				13,133
Total	$ 14,592			14,592
Accumulated Depreciation	(7,370)			(7,370)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	14,592
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	7,370			7,370
Deductions during year [Abstract]
Balance at close of year	$ 7,370
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	24 years
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | French Creek - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				201
Buildings & Improvements				4,735
Costs capitalized subsequent to acquisition				146
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				207
Buildings & Improvements				4,875
Total	$ 5,082			5,082
Accumulated Depreciation	(313)			(313)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,082
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	313			313
Deductions during year [Abstract]
Balance at close of year	$ 313
Multi-Family Residential [Member] | French Creek - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | French Creek - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Gables Townhomes - Sioux Falls, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				1,371
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				349
Buildings & Improvements				1,921
Costs capitalized subsequent to acquisition				237
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				397
Buildings & Improvements				2,110
Total	$ 2,507			2,507
Accumulated Depreciation	(396)			(396)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,507
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	396			396
Deductions during year [Abstract]
Balance at close of year	$ 396
Multi-Family Residential [Member] | Gables Townhomes - Sioux Falls, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Gables Townhomes - Sioux Falls, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Gardens - Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				518
Buildings & Improvements				8,702
Costs capitalized subsequent to acquisition				109
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				528
Buildings & Improvements				8,801
Total	$ 9,329			9,329
Accumulated Depreciation	(770)			(770)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,329
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	770			770
Deductions during year [Abstract]
Balance at close of year	$ 770
Multi-Family Residential [Member] | Gardens - Grand Forks, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Gardens - Grand Forks, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				814
Buildings & Improvements				7,086
Costs capitalized subsequent to acquisition				1,860
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				941
Buildings & Improvements				8,819
Total	$ 9,760			9,760
Accumulated Depreciation	(2,003)			(2,003)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,760
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,003			2,003
Deductions during year [Abstract]
Balance at close of year	$ 2,003
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | GrandeVille at Cascade Lake - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				36,000
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				5,003
Buildings & Improvements				50,363
Costs capitalized subsequent to acquisition				1,551
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				5,065
Buildings & Improvements				51,852
Total	$ 56,917			56,917
Accumulated Depreciation	(4,343)			(4,343)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	56,917
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,343			4,343
Deductions during year [Abstract]
Balance at close of year	$ 4,343
Multi-Family Residential [Member] | GrandeVille at Cascade Lake - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | GrandeVille at Cascade Lake - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				578
Buildings & Improvements				4,122
Costs capitalized subsequent to acquisition				1,314
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				868
Buildings & Improvements				5,146
Total	$ 6,014			6,014
Accumulated Depreciation	(1,604)			(1,604)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,014
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,604			1,604
Deductions during year [Abstract]
Balance at close of year	$ 1,604
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,375
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				403
Buildings & Improvements				6,968
Costs capitalized subsequent to acquisition				3,227
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				666
Buildings & Improvements				9,932
Total	$ 10,598			10,598
Accumulated Depreciation	(4,886)			(4,886)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	10,598
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,886			4,886
Deductions during year [Abstract]
Balance at close of year	$ 4,886
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				2,957
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				655
Buildings & Improvements				14,139
Costs capitalized subsequent to acquisition				514
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				713
Buildings & Improvements				14,595
Total	$ 15,308			15,308
Accumulated Depreciation	(1,772)			(1,772)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	15,308
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,772			1,772
Deductions during year [Abstract]
Balance at close of year	$ 1,772
Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				294
Buildings & Improvements				2,921
Costs capitalized subsequent to acquisition				4,362
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				461
Buildings & Improvements				7,116
Total	$ 7,577			7,577
Accumulated Depreciation	(2,103)			(2,103)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,577
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,103			2,103
Deductions during year [Abstract]
Balance at close of year	$ 2,103
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,083
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				449
Buildings & Improvements				2,725
Costs capitalized subsequent to acquisition				1,832
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				610
Buildings & Improvements				4,396
Total	$ 5,006			5,006
Accumulated Depreciation	(2,299)			(2,299)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,006
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,299			2,299
Deductions during year [Abstract]
Balance at close of year	$ 2,299
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	12 years
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Lakeside Village Lincoln, NE [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				12,307
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,215
Buildings & Improvements				15,837
Costs capitalized subsequent to acquisition				1,011
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,315
Buildings & Improvements				16,748
Total	$ 18,063			18,063
Accumulated Depreciation	(3,075)			(3,075)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	18,063
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,075			3,075
Deductions during year [Abstract]
Balance at close of year	$ 3,075
Multi-Family Residential [Member] | Lakeside Village Lincoln, NE [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Lakeside Village Lincoln, NE [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land					184
Buildings & Improvements					1,514
Costs capitalized subsequent to acquisition					1,175
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					356
Buildings & Improvements					2,517
Total	$ 2,873	2,873			2,873
Accumulated Depreciation		(1,379)			(1,379)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	2,873
Balance at close of year		2,873
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year		1,379			$ 1,379
Deductions during year [Abstract]
Balance at close of year		$ 1,379
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed		30 years
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed		37 years
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				14,327
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,362
Buildings & Improvements				21,727
Costs capitalized subsequent to acquisition				10,396
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,257
Buildings & Improvements				31,228
Total	33,485			33,485
Accumulated Depreciation	(13,904)			(13,904)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	33,485
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	13,904			13,904
Deductions during year [Abstract]
Balance at close of year	$ 13,904
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	24 years
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Legacy Heights - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,207
Buildings & Improvements				13,742
Costs capitalized subsequent to acquisition				384
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,288
Buildings & Improvements				14,045
Total	$ 15,333			15,333
Accumulated Depreciation	(1,237)			(1,237)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	15,333
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,237			1,237
Deductions during year [Abstract]
Balance at close of year	$ 1,237
Multi-Family Residential [Member] | Legacy Heights - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Legacy Heights - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Mariposa - Topeka, KS [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				2,756
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				399
Buildings & Improvements				5,110
Costs capitalized subsequent to acquisition				934
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				453
Buildings & Improvements				5,990
Total	$ 6,443			6,443
Accumulated Depreciation	(2,038)			(2,038)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,443
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,038			2,038
Deductions during year [Abstract]
Balance at close of year	$ 2,038
Multi-Family Residential [Member] | Mariposa - Topeka, KS [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Mariposa - Topeka, KS [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				590
Buildings & Improvements				4,519
Costs capitalized subsequent to acquisition				1,922
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				707
Buildings & Improvements				6,324
Total	$ 7,031			7,031
Accumulated Depreciation	(2,842)			(2,842)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,031
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,842			2,842
Deductions during year [Abstract]
Balance at close of year	$ 2,842
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,734
Buildings & Improvements				30,131
Costs capitalized subsequent to acquisition				32
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,734
Buildings & Improvements				30,163
Total	$ 31,897			31,897
Accumulated Depreciation	(1,742)			(1,742)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	31,897
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,742			1,742
Deductions during year [Abstract]
Balance at close of year	$ 1,742
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				490
Buildings & Improvements				3,756
Costs capitalized subsequent to acquisition				1,053
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				637
Buildings & Improvements				4,662
Total	$ 5,299			5,299
Accumulated Depreciation	(1,743)			(1,743)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,299
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,743			1,743
Deductions during year [Abstract]
Balance at close of year	$ 1,743
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,216
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				303
Buildings & Improvements				3,957
Costs capitalized subsequent to acquisition				1,290
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				376
Buildings & Improvements				5,174
Total	$ 5,550			5,550
Accumulated Depreciation	(2,083)			(2,083)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,550
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,083			2,083
Deductions during year [Abstract]
Balance at close of year	$ 2,083
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	24 years
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Northridge - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				884
Buildings & Improvements				7,515
Costs capitalized subsequent to acquisition				183
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				970
Buildings & Improvements				7,612
Total	$ 8,582			8,582
Accumulated Depreciation	(841)			(841)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,582
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	841			841
Deductions during year [Abstract]
Balance at close of year	$ 841
Multi-Family Residential [Member] | Northridge - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Northridge - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				422
Buildings & Improvements				4,838
Costs capitalized subsequent to acquisition				1,361
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				705
Buildings & Improvements				5,916
Total	$ 6,621			6,621
Accumulated Depreciation	(2,438)			(2,438)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,621
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,438			2,438
Deductions during year [Abstract]
Balance at close of year	$ 2,438
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				543
Buildings & Improvements				2,784
Costs capitalized subsequent to acquisition				4,741
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				868
Buildings & Improvements				7,200
Total	$ 8,068			8,068
Accumulated Depreciation	(5,004)			(5,004)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,068
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	5,004			5,004
Deductions during year [Abstract]
Balance at close of year	$ 5,004
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				9,933
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,164
Buildings & Improvements				10,441
Costs capitalized subsequent to acquisition				3,818
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,824
Buildings & Improvements				13,599
Total	$ 15,423			15,423
Accumulated Depreciation	(6,454)			(6,454)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	15,423
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	6,454			6,454
Deductions during year [Abstract]
Balance at close of year	$ 6,454
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,991
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,034
Buildings & Improvements				6,109
Costs capitalized subsequent to acquisition				2,597
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,271
Buildings & Improvements				8,469
Total	$ 9,740			9,740
Accumulated Depreciation	(2,992)			(2,992)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,740
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,992			2,992
Deductions during year [Abstract]
Balance at close of year	$ 2,992
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Oxbo - St Paul, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				5,809
Buildings & Improvements				51,586
Costs capitalized subsequent to acquisition				66
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				5,809
Buildings & Improvements				51,652
Total	$ 57,461			57,461
Accumulated Depreciation	(1,759)			(1,759)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	57,461
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,759			1,759
Deductions during year [Abstract]
Balance at close of year	$ 1,759
Multi-Family Residential [Member] | Oxbo - St Paul, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Oxbo - St Paul, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				404
Buildings & Improvements				3,152
Costs capitalized subsequent to acquisition				3,707
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				990
Buildings & Improvements				6,273
Total	$ 7,263			7,263
Accumulated Depreciation	(4,227)			(4,227)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,263
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,227			4,227
Deductions during year [Abstract]
Balance at close of year	$ 4,227
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	24 years
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Park Meadows - Waite Park, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				8,041
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,143
Buildings & Improvements				9,099
Costs capitalized subsequent to acquisition				9,686
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,025
Buildings & Improvements				17,903
Total	$ 19,928			19,928
Accumulated Depreciation	(8,722)			(8,722)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	19,928
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	8,722			8,722
Deductions during year [Abstract]
Balance at close of year	$ 8,722
Multi-Family Residential [Member] | Park Meadows - Waite Park, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Park Meadows - Waite Park, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Park Place - Plymouth, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				10,609
Buildings & Improvements				80,781
Costs capitalized subsequent to acquisition				1,967
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				10,609
Buildings & Improvements				82,748
Total	$ 93,357			93,357
Accumulated Depreciation	(1,819)			(1,819)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	93,357
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,819			1,819
Deductions during year [Abstract]
Balance at close of year	$ 1,819
Multi-Family Residential [Member] | Park Place - Plymouth, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Park Place - Plymouth, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				7
Buildings & Improvements				748
Costs capitalized subsequent to acquisition				228
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				63
Buildings & Improvements				920
Total	$ 983			983
Accumulated Depreciation	(459)			(459)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	983
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	459			459
Deductions during year [Abstract]
Balance at close of year	$ 459
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				72
Buildings & Improvements				687
Costs capitalized subsequent to acquisition				458
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				168
Buildings & Improvements				1,049
Total	$ 1,217			1,217
Accumulated Depreciation	(434)			(434)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	1,217
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	434			434
Deductions during year [Abstract]
Balance at close of year	$ 434
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Plaza - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				4,915
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				867
Buildings & Improvements				12,784
Costs capitalized subsequent to acquisition				2,864
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				998
Buildings & Improvements				15,517
Total	$ 16,515			16,515
Accumulated Depreciation	(3,958)			(3,958)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	16,515
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,958			3,958
Deductions during year [Abstract]
Balance at close of year	$ 3,958
Multi-Family Residential [Member] | Plaza - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Plaza - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				2,438
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				240
Buildings & Improvements				3,538
Costs capitalized subsequent to acquisition				2,022
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				410
Buildings & Improvements				5,390
Total	$ 5,800			5,800
Accumulated Depreciation	(3,032)			(3,032)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,800
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,032			3,032
Deductions during year [Abstract]
Balance at close of year	$ 3,032
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	24 years
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Ponds at Heritage Place - Sartell, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				395
Buildings & Improvements				4,564
Costs capitalized subsequent to acquisition				441
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				410
Buildings & Improvements				4,990
Total	$ 5,400			5,400
Accumulated Depreciation	(919)			(919)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,400
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	919			919
Deductions during year [Abstract]
Balance at close of year	$ 919
Multi-Family Residential [Member] | Ponds at Heritage Place - Sartell, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Ponds at Heritage Place - Sartell, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				1,315
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				144
Buildings & Improvements				1,816
Costs capitalized subsequent to acquisition				732
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				309
Buildings & Improvements				2,383
Total	$ 2,692			2,692
Accumulated Depreciation	(1,509)			(1,509)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,692
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,509			1,509
Deductions during year [Abstract]
Balance at close of year	$ 1,509
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	24 years
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Quarry Ridge - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				25,662
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				2,254
Buildings & Improvements				30,024
Costs capitalized subsequent to acquisition				2,058
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,406
Buildings & Improvements				31,930
Total	$ 34,336			34,336
Accumulated Depreciation	(7,649)			(7,649)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	34,336
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	7,649			7,649
Deductions during year [Abstract]
Balance at close of year	$ 7,649
Multi-Family Residential [Member] | Quarry Ridge - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Quarry Ridge - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Red 20 - Minneapolis, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				22,518
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,900
Buildings & Improvements				24,116
Costs capitalized subsequent to acquisition				41
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,908
Buildings & Improvements				24,149
Total	$ 26,057			26,057
Accumulated Depreciation	(3,361)			(3,361)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	26,057
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,361			3,361
Deductions during year [Abstract]
Balance at close of year	$ 3,361
Multi-Family Residential [Member] | Red 20 - Minneapolis, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Red 20 - Minneapolis, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				7,976
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				702
Buildings & Improvements				10,198
Costs capitalized subsequent to acquisition				2,356
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,019
Buildings & Improvements				12,237
Total	$ 13,256			13,256
Accumulated Depreciation	(2,637)			(2,637)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	13,256
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,637			2,637
Deductions during year [Abstract]
Balance at close of year	$ 2,637
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Renaissance Heights - Williston, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				22,739
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				3,080
Buildings & Improvements				15,389
Costs capitalized subsequent to acquisition				265
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				3,117
Buildings & Improvements				15,617
Total	$ 18,734			18,734
Accumulated Depreciation	(826)			(826)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	18,734
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	826			826
Deductions during year [Abstract]
Balance at close of year	$ 826
Multi-Family Residential [Member] | Renaissance Heights - Williston, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Renaissance Heights - Williston, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,175
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				178
Buildings & Improvements				4,073
Costs capitalized subsequent to acquisition				2,921
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				307
Buildings & Improvements				6,865
Total	$ 7,172			7,172
Accumulated Depreciation	(2,999)			(2,999)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,172
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,999			2,999
Deductions during year [Abstract]
Balance at close of year	$ 2,999
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,092
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				330
Buildings & Improvements				3,489
Costs capitalized subsequent to acquisition				2,018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				516
Buildings & Improvements				5,321
Total	$ 5,837			5,837
Accumulated Depreciation	(2,425)			(2,425)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,837
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,425			2,425
Deductions during year [Abstract]
Balance at close of year	$ 2,425
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				576
Buildings & Improvements				24,670
Costs capitalized subsequent to acquisition				870
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				779
Buildings & Improvements				25,337
Total	$ 26,116			26,116
Accumulated Depreciation	(4,492)			(4,492)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	26,116
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,492			4,492
Deductions during year [Abstract]
Balance at close of year	$ 4,492
Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				4,795
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				656
Buildings & Improvements				5,726
Costs capitalized subsequent to acquisition				1,531
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				802
Buildings & Improvements				7,111
Total	$ 7,913			7,913
Accumulated Depreciation	(3,849)			(3,849)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,913
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,849			3,849
Deductions during year [Abstract]
Balance at close of year	$ 3,849
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,294
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				843
Buildings & Improvements				4,823
Costs capitalized subsequent to acquisition				391
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				864
Buildings & Improvements				5,193
Total	$ 6,057			6,057
Accumulated Depreciation	(1,543)			(1,543)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,057
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,543			1,543
Deductions during year [Abstract]
Balance at close of year	$ 1,543
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				11,439
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,142
Buildings & Improvements				14,684
Costs capitalized subsequent to acquisition				5,036
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,996
Buildings & Improvements				18,866
Total	$ 20,862			20,862
Accumulated Depreciation	(8,743)			(8,743)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	20,862
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	8,743			8,743
Deductions during year [Abstract]
Balance at close of year	$ 8,743
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				241
Buildings & Improvements				2,097
Costs capitalized subsequent to acquisition				581
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				283
Buildings & Improvements				2,636
Total	$ 2,919			2,919
Accumulated Depreciation	(571)			(571)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,919
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	571			571
Deductions during year [Abstract]
Balance at close of year	$ 571
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				2,116
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				215
Buildings & Improvements				3,007
Costs capitalized subsequent to acquisition				639
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				256
Buildings & Improvements				3,605
Total	$ 3,861			3,861
Accumulated Depreciation	(448)			(448)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	3,861
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	448			448
Deductions during year [Abstract]
Balance at close of year	$ 448
Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				8,018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				550
Buildings & Improvements				9,548
Costs capitalized subsequent to acquisition				5,208
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,372
Buildings & Improvements				13,934
Total	$ 15,306			15,306
Accumulated Depreciation	(7,460)			(7,460)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	15,306
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	7,460			7,460
Deductions during year [Abstract]
Balance at close of year	$ 7,460
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	24 years
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Southpoint - Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				576
Buildings & Improvements				9,893
Costs capitalized subsequent to acquisition				166
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				633
Buildings & Improvements				10,002
Total	$ 10,635			10,635
Accumulated Depreciation	(1,302)			(1,302)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	10,635
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,302			1,302
Deductions during year [Abstract]
Balance at close of year	$ 1,302
Multi-Family Residential [Member] | Southpoint - Grand Forks, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Southpoint - Grand Forks, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				5,125
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				400
Buildings & Improvements				5,034
Costs capitalized subsequent to acquisition				3,553
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				825
Buildings & Improvements				8,162
Total	$ 8,987			8,987
Accumulated Depreciation	(4,680)			(4,680)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,987
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,680			4,680
Deductions during year [Abstract]
Balance at close of year	$ 4,680
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	24 years
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Sunset Trail - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				7,581
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				336
Buildings & Improvements				12,814
Costs capitalized subsequent to acquisition				3,239
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				720
Buildings & Improvements				15,669
Total	$ 16,389			16,389
Accumulated Depreciation	(7,108)			(7,108)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	16,389
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	7,108			7,108
Deductions during year [Abstract]
Balance at close of year	$ 7,108
Multi-Family Residential [Member] | Sunset Trail - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Sunset Trail - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				5,574
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				600
Buildings & Improvements				10,306
Costs capitalized subsequent to acquisition				5,139
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,642
Buildings & Improvements				14,403
Total	$ 16,045			16,045
Accumulated Depreciation	(6,178)			(6,178)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	16,045
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	6,178			6,178
Deductions during year [Abstract]
Balance at close of year	$ 6,178
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				3,607
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				294
Buildings & Improvements				4,137
Costs capitalized subsequent to acquisition				3,950
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,193
Buildings & Improvements				7,188
Total	$ 8,381			8,381
Accumulated Depreciation	(3,719)			(3,719)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,381
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,719			3,719
Deductions during year [Abstract]
Balance at close of year	$ 3,719
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				11,523
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,590
Buildings & Improvements				15,760
Costs capitalized subsequent to acquisition				1,664
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,226
Buildings & Improvements				16,788
Total	$ 19,014			19,014
Accumulated Depreciation	(3,177)			(3,177)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	19,014
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,177			3,177
Deductions during year [Abstract]
Balance at close of year	$ 3,177
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				234
Buildings & Improvements				2,296
Costs capitalized subsequent to acquisition				1,047
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				359
Buildings & Improvements				3,218
Total	$ 3,577			3,577
Accumulated Depreciation	(1,281)			(1,281)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	3,577
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,281			1,281
Deductions during year [Abstract]
Balance at close of year	$ 1,281
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Westend - Denver CO [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				25,525
Buildings & Improvements				102,180
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				25,525
Buildings & Improvements				102,180
Total	$ 127,705			127,705
Accumulated Depreciation	(501)			(501)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	127,705
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	501			501
Deductions during year [Abstract]
Balance at close of year	$ 501
Multi-Family Residential [Member] | Westend - Denver CO [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Westend - Denver CO [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				7,865
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				939
Buildings & Improvements				10,167
Costs capitalized subsequent to acquisition				7,593
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,810
Buildings & Improvements				16,889
Total	$ 18,699			18,699
Accumulated Depreciation	(9,013)			(9,013)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	18,699
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	9,013			9,013
Deductions during year [Abstract]
Balance at close of year	$ 9,013
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				1,841
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				116
Buildings & Improvements				1,909
Costs capitalized subsequent to acquisition				2,043
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				292
Buildings & Improvements				3,776
Total	$ 4,068			4,068
Accumulated Depreciation	(1,987)			(1,987)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	4,068
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,987			1,987
Deductions during year [Abstract]
Balance at close of year	$ 1,987
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				20,844
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				2,139
Buildings & Improvements				25,424
Costs capitalized subsequent to acquisition				1,542
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,418
Buildings & Improvements				26,687
Total	$ 29,105			29,105
Accumulated Depreciation	(4,407)			(4,407)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	29,105
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,407			4,407
Deductions during year [Abstract]
Balance at close of year	$ 4,407
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				6,283
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,400
Buildings & Improvements				10,200
Costs capitalized subsequent to acquisition				336
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,445
Buildings & Improvements				10,491
Total	$ 11,936			11,936
Accumulated Depreciation	(576)			(576)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	11,936
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	576			576
Deductions during year [Abstract]
Balance at close of year	$ 576
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				748
Buildings & Improvements				5,622
Costs capitalized subsequent to acquisition				2,516
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,044
Buildings & Improvements				7,842
Total	$ 8,886			8,886
Accumulated Depreciation	(3,206)			(3,206)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,886
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,206			3,206
Deductions during year [Abstract]
Balance at close of year	$ 3,206
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				5,737
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				370
Buildings & Improvements				6,028
Costs capitalized subsequent to acquisition				3,089
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				750
Buildings & Improvements				8,737
Total	$ 9,487			9,487
Accumulated Depreciation	(4,663)			(4,663)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,487
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,663			4,663
Deductions during year [Abstract]
Balance at close of year	$ 4,663
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi-Family Residential [Member] | Wholly Owned Properties [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Additions	$ 369,332	$ 61,565	$ 285,080
Other - Mixed Use [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				6,522
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				389
Buildings & Improvements				17,319
Costs capitalized subsequent to acquisition				4,947
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				598
Buildings & Improvements				22,057
Total	22,655			22,655
Accumulated Depreciation	(4,046)			(4,046)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	22,655
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	4,046			4,046
Deductions during year [Abstract]
Balance at close of year	4,046
Other - Mixed Use [Member] | 71 France - Edina, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				0
Buildings & Improvements				5,879
Costs capitalized subsequent to acquisition				774
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				0
Buildings & Improvements				6,653
Total	6,653			6,653
Accumulated Depreciation	(397)			(397)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,653
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	397			397
Deductions during year [Abstract]
Balance at close of year	$ 397
Other - Mixed Use [Member] | 71 France - Edina, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Mixed Use [Member] | 71 France - Edina, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Mixed Use [Member] | Oxbo - St Paul, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				0
Buildings & Improvements				3,471
Costs capitalized subsequent to acquisition				54
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				0
Buildings & Improvements				3,525
Total	$ 3,525			3,525
Accumulated Depreciation	(113)			(113)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	3,525
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	113			113
Deductions during year [Abstract]
Balance at close of year	$ 113
Other - Mixed Use [Member] | Oxbo - St Paul, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Mixed Use [Member] | Oxbo - St Paul, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Mixed Use [Member] | Plaza - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				6,522
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				389
Buildings & Improvements				5,444
Costs capitalized subsequent to acquisition				3,764
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				598
Buildings & Improvements				8,999
Total	$ 9,597			9,597
Accumulated Depreciation	(3,226)			(3,226)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,597
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,226			3,226
Deductions during year [Abstract]
Balance at close of year	$ 3,226
Other - Mixed Use [Member] | Plaza - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Mixed Use [Member] | Plaza - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Mixed Use [Member] | Red 20 - Minneapolis, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				0
Buildings & Improvements				2,525
Costs capitalized subsequent to acquisition				355
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				0
Buildings & Improvements				2,880
Total	$ 2,880			2,880
Accumulated Depreciation	(310)			(310)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,880
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	310			310
Deductions during year [Abstract]
Balance at close of year	$ 310
Other - Mixed Use [Member] | Red 20 - Minneapolis, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Mixed Use [Member] | Red 20 - Minneapolis, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				6,112
Buildings & Improvements				24,240
Costs capitalized subsequent to acquisition				10,336
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				6,214
Buildings & Improvements				34,474
Total	$ 40,688			40,688
Accumulated Depreciation	(12,801)			(12,801)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	40,688
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	12,801			12,801
Deductions during year [Abstract]
Balance at close of year	12,801
Other - Commercial [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				2,133
Buildings & Improvements				1,864
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				2,133
Buildings & Improvements				1,864
Total	3,997			3,997
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	3,997
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	$ 0
Other - Commercial [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member] | Dakota West Plaza - Minot , ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				92
Buildings & Improvements				493
Costs capitalized subsequent to acquisition				30
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				106
Buildings & Improvements				509
Total	$ 615			615
Accumulated Depreciation	(173)			(173)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	615
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	173			173
Deductions during year [Abstract]
Balance at close of year	$ 173
Other - Commercial [Member] | Dakota West Plaza - Minot , ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Dakota West Plaza - Minot , ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member] | Fresenius - Duluth, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				50
Buildings & Improvements				1,520
Costs capitalized subsequent to acquisition				2
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				50
Buildings & Improvements				1,522
Total	$ 1,572			1,572
Accumulated Depreciation	(547)			(547)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	1,572
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	547			547
Deductions during year [Abstract]
Balance at close of year	$ 547
Other - Commercial [Member] | Fresenius - Duluth, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Fresenius - Duluth, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member] | Minot 1400 31st Ave - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,026
Buildings & Improvements				6,143
Costs capitalized subsequent to acquisition				4,422
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,038
Buildings & Improvements				10,553
Total	$ 11,591			11,591
Accumulated Depreciation	(5,334)			(5,334)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	11,591
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	5,334			5,334
Deductions during year [Abstract]
Balance at close of year	$ 5,334
Other - Commercial [Member] | Minot 1400 31st Ave - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Minot 1400 31st Ave - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member] | Minot 2505 16th Street SW - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				298
Buildings & Improvements				1,724
Costs capitalized subsequent to acquisition				296
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				298
Buildings & Improvements				2,020
Total	$ 2,318			2,318
Accumulated Depreciation	(544)			(544)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,318
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	544			544
Deductions during year [Abstract]
Balance at close of year	$ 544
Other - Commercial [Member] | Minot 2505 16th Street SW - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Minot 2505 16th Street SW - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member] | Minot Arrowhead - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				100
Buildings & Improvements				3,216
Costs capitalized subsequent to acquisition				5,586
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				176
Buildings & Improvements				8,726
Total	$ 8,902			8,902
Accumulated Depreciation	(3,191)			(3,191)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,902
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,191			3,191
Deductions during year [Abstract]
Balance at close of year	$ 3,191
Other - Commercial [Member] | Minot Arrowhead - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Minot Arrowhead - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member] | Minot IPS - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				416
Buildings & Improvements				5,952
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				416
Buildings & Improvements				5,952
Total	$ 6,368			6,368
Accumulated Depreciation	(3,012)			(3,012)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,368
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	3,012			3,012
Deductions during year [Abstract]
Balance at close of year	$ 3,012
Other - Commercial [Member] | Minot IPS - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Minot IPS - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member] | Minot Southgate Retail - Minot, ND [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				889
Buildings & Improvements				1,036
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				889
Buildings & Improvements				1,036
Total	$ 1,925			1,925
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	1,925
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	$ 0
Other - Commercial [Member] | Minot Southgate Retail - Minot, ND [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Minot Southgate Retail - Minot, ND [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				1,108
Buildings & Improvements				2,292
Costs capitalized subsequent to acquisition				0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				1,108
Buildings & Improvements				2,292
Total	$ 3,400			3,400
Accumulated Depreciation	0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	3,400
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	0			0
Deductions during year [Abstract]
Balance at close of year	$ 0
Other - Commercial [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] | Minimum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	30 years
Other - Commercial [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] | Maximum [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Subtotal [Member]
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances				512,140
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land				142,407
Buildings & Improvements				1,330,889
Costs capitalized subsequent to acquisition				196,468
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land				163,962
Buildings & Improvements				1,505,802
Total	$ 1,669,764			1,669,764
Accumulated Depreciation	(311,324)			(311,324)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	1,669,764
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	311,324			$ 311,324
Deductions during year [Abstract]
Balance at close of year	$ 311,324