SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands	8 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Apr. 30, 2018	Apr. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2018	Apr. 30, 2017
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					$ 331,376
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land					136,857
Buildings & Improvements					1,338,692
Costs capitalized subsequent to acquisition					168,912
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					156,047
Buildings & Improvements					1,488,407
Total		$ 1,644,454			1,644,454
Accumulated Depreciation	$ (311,324)	(349,122)	$ (311,324)	$ (237,859)	(349,122)	$ (353,871)	$ (311,324)	$ (255,599)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Write down of asset and accumulated depreciation on impaired assets	0	0	(8,597)	(7,144)
Other	0	0	(74)	0
Balance at close of year		1,644,454
Total real estate investments					1,311,472	1,289,476	1,380,245
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	311,324	353,871	255,599	237,859
Additions during year [Abstract]
Provisions for depreciation	49,208	71,787	78,785	42,960
Deductions during year [Abstract]
Accumulated depreciation on real estate sold or classified as held for sale	(6,609)	(72,758)	(11,033)	(14,687)
Write down of asset and accumulated depreciation on impaired assets	0	0	(8,597)	(7,144)
Other	(52)	(3,778)	(3,430)	(3,389)
Balance at close of year	353,871	349,122	311,324	255,599
Net basis of real estate investments for federal income tax purposes					1,300,000	1,200,000	1,500,000	1,400,000
Unimproved Land
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	11,476	1,376	18,455	18,455	1,376	5,301	11,476	18,455
Accumulated Depreciation		0			0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	11,476	5,301	18,455	20,939
Improvements and Other	0	0	0	1,024
Cost of real estate sold	(4,954)	(3,925)	(1,000)	0
Impairment charge	(1,221)	0	(2,617)	(3,508)
Properties classified as held for sale during the year	0	0	(3,288)	0
Development placed in service	0	0	0	0
Balance at close of year	5,301	1,376	11,476	18,455
Total real estate investments					1,295,331	1,279,066	1,369,916	1,121,385
Deductions during year [Abstract]
Balance at close of year		0
Unimproved Land | Rapid City - Rapid City, SD
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
Deductions during year [Abstract]
Balance at close of year		0
Wholly Owned Properties
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Total	1,669,764	1,627,636	1,358,529	1,358,529	1,643,077	1,627,636	1,669,764	1,358,529
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	1,669,764	1,627,636	1,358,529	1,369,893
Improvements and Other	11,620	21,868	15,065	34,761
Total Additions	1,681,384	1,818,008	1,742,926	1,466,219
Cost of real estate sold	(53,653)	(171,112)	(46,001)	(21,601)
Impairment charge	0	0	(15,192)	(51,401)
Write down of asset and accumulated depreciation on impaired assets	0	0	(8,597)	(7,144)
Properties classified as held for sale during the year	0	0	0	(24,156)
Other	(95)	(3,819)	(3,372)	(3,388)
Balance at close of year	1,627,636	1,643,077	1,669,764	1,358,529
Deductions during year [Abstract]
Write down of asset and accumulated depreciation on impaired assets	0	0	(8,597)	(7,144)
Development in Progress
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Total	0	0	0	51,681	0	$ 0	$ 0	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	0	0	0	51,681
Improvements and Other	0	0	0	7,762
Properties classified as held for sale during the year	0	0	0	0
Development placed in service	0	0	0	(59,443)
Balance at close of year	0	0	0	0
Same-Store
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					309,701
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land					77,779
Buildings & Improvements					928,945
Costs capitalized subsequent to acquisition					159,026
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					96,675
Buildings & Improvements					1,069,075
Total		1,165,750			1,165,750
Accumulated Depreciation		(319,456)			(319,456)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		1,165,750
Deductions during year [Abstract]
Balance at close of year		319,456
Same-Store | 71 France - Edina, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					54,459
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					312
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					4,801
Buildings & Improvements					61,994
Total		66,795			66,795
Accumulated Depreciation		(11,070)			(11,070)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		66,795
Deductions during year [Abstract]
Balance at close of year		$ 11,070
Same-Store | 71 France - Edina, MN | Minimum
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
Same-Store | 71 France - Edina, MN | Maximum
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
Same-Store | Alps Park - Rapid City, SD
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					3,426
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					397
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					333
Buildings & Improvements					5,902
Total		$ 6,235			6,235
Accumulated Depreciation		(1,350)			(1,350)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		6,235
Deductions during year [Abstract]
Balance at close of year		$ 1,350
Same-Store | Alps Park - Rapid City, SD | Minimum
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
Same-Store | Alps Park - Rapid City, SD | Maximum
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
Same-Store | Arcata - Golden Valley, 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					2,088
Buildings & Improvements					31,036
Costs capitalized subsequent to acquisition					262
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					2,130
Buildings & Improvements					31,256
Total		$ 33,386			33,386
Accumulated Depreciation		(6,946)			(6,946)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		33,386
Deductions during year [Abstract]
Balance at close of year		$ 6,946
Same-Store | Arcata - Golden Valley, MN | Minimum
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
Same-Store | Arcata - Golden Valley, MN | Maximum
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
Same-Store | Ashland - Grand Forks, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					4,993
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					329
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					824
Buildings & Improvements					7,815
Total		$ 8,639			8,639
Accumulated Depreciation		(2,016)			(2,016)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		8,639
Deductions during year [Abstract]
Balance at close of year		$ 2,016
Same-Store | Ashland - Grand Forks, ND | Minimum
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
Same-Store | Ashland - Grand Forks, ND | Maximum
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
Same-Store | 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					498
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,731
Buildings & Improvements					34,457
Total		$ 36,188			36,188
Accumulated Depreciation		(4,573)			(4,573)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		36,188
Deductions during year [Abstract]
Balance at close of year		$ 4,573
Same-Store | Avalon Cove - Rochester, MN | Minimum
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
Same-Store | Avalon Cove - Rochester, MN | Maximum
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
Same-Store | Boulder Court - Eagan, 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					1,067
Buildings & Improvements					5,498
Costs capitalized subsequent to acquisition					3,276
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,576
Buildings & Improvements					8,265
Total		$ 9,841			9,841
Accumulated Depreciation		(4,014)			(4,014)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		9,841
Deductions during year [Abstract]
Balance at close of year		$ 4,014
Same-Store | Boulder Court - Eagan, MN | Minimum
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
Same-Store | Boulder Court - Eagan, MN | Maximum
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
Same-Store | Canyon Lake - Rapid City, SD
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					2,573
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					2,404
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					420
Buildings & Improvements					6,247
Total		$ 6,667			6,667
Accumulated Depreciation		(3,006)			(3,006)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		6,667
Deductions during year [Abstract]
Balance at close of year		$ 3,006
Same-Store | Canyon Lake - Rapid City, SD | Minimum
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
Same-Store | Canyon Lake - Rapid City, SD | Maximum
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
Same-Store | 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					200
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,702
Buildings & Improvements					33,498
Total		$ 35,200			35,200
Accumulated Depreciation		(1,829)			(1,829)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		35,200
Deductions during year [Abstract]
Balance at close of year		$ 1,829
Same-Store | Cardinal Point - Grand Forks, ND | Minimum
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
Same-Store | Cardinal Point - Grand Forks, ND | Maximum
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
Same-Store | 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					99
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,587
Buildings & Improvements					16,807
Total		$ 18,394			18,394
Accumulated Depreciation		(2,299)			(2,299)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		18,394
Deductions during year [Abstract]
Balance at close of year		$ 2,299
Same-Store | Cascade Shores - Rochester, MN | Minimum
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
Same-Store | Cascade Shores - Rochester, MN | Maximum
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
Same-Store | Castlerock - Billings, MT
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					736
Buildings & Improvements					4,864
Costs capitalized subsequent to acquisition					2,452
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,045
Buildings & Improvements					7,007
Total		$ 8,052			8,052
Accumulated Depreciation		(4,185)			(4,185)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		8,052
Deductions during year [Abstract]
Balance at close of year		$ 4,185
Same-Store | Castlerock - Billings, MT | Minimum
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
Same-Store | Castlerock - Billings, MT | Maximum
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
Same-Store | Chateau - Minot, 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					301
Buildings & Improvements					20,058
Costs capitalized subsequent to acquisition					1,023
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					326
Buildings & Improvements					21,056
Total		$ 21,382			21,382
Accumulated Depreciation		(5,095)			(5,095)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		21,382
Deductions during year [Abstract]
Balance at close of year		$ 5,095
Same-Store | Chateau - Minot, ND | Minimum
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
Same-Store | Chateau - Minot, ND | Maximum
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
Same-Store | Cimarron Hills - Omaha, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					8,700
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					5,016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,590
Buildings & Improvements					13,720
Total		$ 15,310			15,310
Accumulated Depreciation		(7,214)			(7,214)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		15,310
Deductions during year [Abstract]
Balance at close of year		$ 7,214
Same-Store | Cimarron Hills - Omaha, NE | Minimum
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
Same-Store | Cimarron Hills - Omaha, NE | Maximum
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
Same-Store | Colonial Villa - Burnsville, 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					2,401
Buildings & Improvements					11,515
Costs capitalized subsequent to acquisition					10,568
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					2,987
Buildings & Improvements					21,497
Total		$ 24,484			24,484
Accumulated Depreciation		(11,044)			(11,044)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		24,484
Deductions during year [Abstract]
Balance at close of year		$ 11,044
Same-Store | Colonial Villa - Burnsville, MN | Minimum
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
Same-Store | Colonial Villa - Burnsville, MN | Maximum
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
Same-Store | Colony - Lincoln, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					11,936
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					1,984
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,845
Buildings & Improvements					17,384
Total		$ 19,229			19,229
Accumulated Depreciation		(4,686)			(4,686)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		19,229
Deductions during year [Abstract]
Balance at close of year		$ 4,686
Same-Store | Colony - Lincoln, NE | Minimum
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
Same-Store | Colony - Lincoln, NE | Maximum
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
Same-Store | Commons and Landing at Southgate - Minot, 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					5,945
Buildings & Improvements					47,512
Costs capitalized subsequent to acquisition					1,801
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					6,419
Buildings & Improvements					48,839
Total		$ 55,258			55,258
Accumulated Depreciation		(11,401)			(11,401)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		55,258
Deductions during year [Abstract]
Balance at close of year		$ 11,401
Same-Store | Commons and Landing at Southgate - Minot, ND | Minimum
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
Same-Store | Commons and Landing at Southgate - Minot, ND | Maximum
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
Same-Store | Cottonwood - Bismarck, 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					1,056
Buildings & Improvements					17,372
Costs capitalized subsequent to acquisition					5,956
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					2,001
Buildings & Improvements					22,383
Total		$ 24,384			24,384
Accumulated Depreciation		(11,253)			(11,253)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		24,384
Deductions during year [Abstract]
Balance at close of year		$ 11,253
Same-Store | Cottonwood - Bismarck, ND | Minimum
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
Same-Store | Cottonwood - Bismarck, ND | Maximum
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
Same-Store | Country Meadows - Billings, MT
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					491
Buildings & Improvements					7,809
Costs capitalized subsequent to acquisition					1,788
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					599
Buildings & Improvements					9,489
Total		$ 10,088			10,088
Accumulated Depreciation		(5,457)			(5,457)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		10,088
Deductions during year [Abstract]
Balance at close of year		$ 5,457
Same-Store | Country Meadows - Billings, MT | Minimum
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
Same-Store | Country Meadows - Billings, MT | Maximum
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
Same-Store | 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					299
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					438
Buildings & Improvements					11,719
Total		$ 12,157			12,157
Accumulated Depreciation		(1,528)			(1,528)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		12,157
Deductions during year [Abstract]
Balance at close of year		$ 1,528
Same-Store | Crystal Bay - Rochester, MN | Minimum
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
Same-Store | Crystal Bay - Rochester, MN | Maximum
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
Same-Store | Cypress Court - St. Cloud, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					11,934
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					443
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,619
Buildings & Improvements					19,286
Total		$ 20,905			20,905
Accumulated Depreciation		(4,474)			(4,474)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		20,905
Deductions during year [Abstract]
Balance at close of year		$ 4,474
Same-Store | Cypress Court - St. Cloud, MN | Minimum
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
Same-Store | Cypress Court - St. Cloud, MN | Maximum
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
Same-Store | Deer Ridge - Jamestown, 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					711
Buildings & Improvements					24,129
Costs capitalized subsequent to acquisition					269
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					778
Buildings & Improvements					24,331
Total		$ 25,109			25,109
Accumulated Depreciation		(4,877)			(4,877)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		25,109
Deductions during year [Abstract]
Balance at close of year		$ 4,877
Same-Store | Deer Ridge - Jamestown, ND | Minimum
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
Same-Store | Deer Ridge - Jamestown, ND | Maximum
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
Same-Store | Evergreen - Isanti, 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					1,129
Buildings & Improvements					5,524
Costs capitalized subsequent to acquisition					531
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,145
Buildings & Improvements					6,039
Total		$ 7,184			7,184
Accumulated Depreciation		(1,782)			(1,782)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		7,184
Deductions during year [Abstract]
Balance at close of year		$ 1,782
Same-Store | Evergreen - Isanti, MN | Minimum
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
Same-Store | Evergreen - Isanti, MN | Maximum
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
Same-Store | Forest Park - 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					810
Buildings & Improvements					5,579
Costs capitalized subsequent to acquisition					8,894
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,532
Buildings & Improvements					13,751
Total		$ 15,283			15,283
Accumulated Depreciation		(8,519)			(8,519)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		15,283
Deductions during year [Abstract]
Balance at close of year		$ 8,519
Same-Store | Forest Park - Grand Forks, ND | Minimum
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
Same-Store | Forest Park - Grand Forks, ND | Maximum
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
Same-Store | French Creek - 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					201
Buildings & Improvements					4,735
Costs capitalized subsequent to acquisition					238
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					207
Buildings & Improvements					4,967
Total		$ 5,174			5,174
Accumulated Depreciation		(619)			(619)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		5,174
Deductions during year [Abstract]
Balance at close of year		$ 619
Same-Store | French Creek - Rochester, MN | Minimum
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
Same-Store | French Creek - Rochester, MN | Maximum
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
Same-Store | Gardens - 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					518
Buildings & Improvements					8,702
Costs capitalized subsequent to acquisition					125
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					535
Buildings & Improvements					8,810
Total		$ 9,345			9,345
Accumulated Depreciation		(1,387)			(1,387)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		9,345
Deductions during year [Abstract]
Balance at close of year		$ 1,387
Same-Store | Gardens - Grand Forks, ND | Minimum
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
Same-Store | Gardens - Grand Forks, ND | Maximum
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
Same-Store | Grand Gateway - St. Cloud, 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					814
Buildings & Improvements					7,086
Costs capitalized subsequent to acquisition					1,969
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					961
Buildings & Improvements					8,908
Total		$ 9,869			9,869
Accumulated Depreciation		(2,962)			(2,962)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		9,869
Deductions during year [Abstract]
Balance at close of year		$ 2,962
Same-Store | Grand Gateway - St. Cloud, MN | Minimum
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
Same-Store | Grand Gateway - St. Cloud, MN | Maximum
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
Same-Store | GrandeVille at Cascade Lake - Rochester, MN
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					1,843
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					5,095
Buildings & Improvements					52,114
Total		$ 57,209			57,209
Accumulated Depreciation		(8,040)			(8,040)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		57,209
Deductions during year [Abstract]
Balance at close of year		$ 8,040
Same-Store | GrandeVille at Cascade Lake - Rochester, MN | Minimum
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
Same-Store | GrandeVille at Cascade Lake - Rochester, MN | Maximum
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
Same-Store | Greenfield - Omaha, NE
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					1,513
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					872
Buildings & Improvements					5,341
Total		$ 6,213			6,213
Accumulated Depreciation		(2,064)			(2,064)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		6,213
Deductions during year [Abstract]
Balance at close of year		$ 2,064
Same-Store | Greenfield - Omaha, NE | Minimum
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
Same-Store | Greenfield - Omaha, NE | Maximum
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
Same-Store | Heritage Manor - 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					403
Buildings & Improvements					6,968
Costs capitalized subsequent to acquisition					3,487
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					731
Buildings & Improvements					10,127
Total		$ 10,858			10,858
Accumulated Depreciation		(5,712)			(5,712)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		10,858
Deductions during year [Abstract]
Balance at close of year		$ 5,712
Same-Store | Heritage Manor - Rochester, MN | Minimum
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
Same-Store | Heritage Manor - Rochester, MN | Maximum
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
Same-Store | Homestead Garden - Rapid City, SD
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					655
Buildings & Improvements					14,139
Costs capitalized subsequent to acquisition					784
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					723
Buildings & Improvements					14,855
Total		$ 15,578			15,578
Accumulated Depreciation		(2,845)			(2,845)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		15,578
Deductions during year [Abstract]
Balance at close of year		$ 2,845
Same-Store | Homestead Garden - Rapid City, SD | Minimum
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
Same-Store | Homestead Garden - Rapid City, SD | Maximum
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
Same-Store | Lakeside Village - Lincoln, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					11,806
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					1,475
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,401
Buildings & Improvements					17,126
Total		$ 18,527			18,527
Accumulated Depreciation		(4,458)			(4,458)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		18,527
Deductions during year [Abstract]
Balance at close of year		$ 4,458
Same-Store | Lakeside Village - Lincoln, NE | Minimum
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
Same-Store | Lakeside Village - Lincoln, NE | Maximum
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
Same-Store | Landmark - 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					184
Buildings & Improvements					1,514
Costs capitalized subsequent to acquisition					1,262
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					425
Buildings & Improvements					2,535
Total		$ 2,960			2,960
Accumulated Depreciation		(1,588)			(1,588)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		2,960
Deductions during year [Abstract]
Balance at close of year		$ 1,588
Same-Store | Landmark - Grand Forks, ND | Minimum
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
Same-Store | Landmark - Grand Forks, ND | Maximum
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
Same-Store | Legacy - Grand Forks, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					13,565
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					10,738
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					2,431
Buildings & Improvements					31,396
Total		$ 33,827			33,827
Accumulated Depreciation		(16,893)			(16,893)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		33,827
Deductions during year [Abstract]
Balance at close of year		$ 16,893
Same-Store | Legacy - Grand Forks, ND | Minimum
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
Same-Store | Legacy - Grand Forks, ND | Maximum
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
Same-Store | Legacy Heights - Bismarck, 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					1,207
Buildings & Improvements					13,742
Costs capitalized subsequent to acquisition					338
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,226
Buildings & Improvements					14,061
Total		$ 15,287			15,287
Accumulated Depreciation		(2,091)			(2,091)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		15,287
Deductions during year [Abstract]
Balance at close of year		$ 2,091
Same-Store | Legacy Heights - Bismarck, ND | Minimum
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
Same-Store | Legacy Heights - Bismarck, ND | Maximum
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
Same-Store | Meadows - Jamestown, 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					590
Buildings & Improvements					4,519
Costs capitalized subsequent to acquisition					1,993
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					733
Buildings & Improvements					6,369
Total		$ 7,102			7,102
Accumulated Depreciation		(3,438)			(3,438)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		7,102
Deductions during year [Abstract]
Balance at close of year		$ 3,438
Same-Store | Meadows - Jamestown, ND | Minimum
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
Same-Store | Meadows - Jamestown, ND | Maximum
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
Same-Store | Monticello Crossings - Monticello, 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					1,734
Buildings & Improvements					30,136
Costs capitalized subsequent to acquisition					110
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,761
Buildings & Improvements					30,219
Total		$ 31,980			31,980
Accumulated Depreciation		(4,013)			(4,013)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		31,980
Deductions during year [Abstract]
Balance at close of year		4,013
Same-Store | Monticello Village - Monticello, 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					490
Buildings & Improvements					3,756
Costs capitalized subsequent to acquisition					1,211
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					638
Buildings & Improvements					4,819
Total		5,457			5,457
Accumulated Depreciation		(2,161)			(2,161)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		5,457
Deductions during year [Abstract]
Balance at close of year		$ 2,161
Same-Store | Monticello Village - Monticello, MN | Minimum
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
Same-Store | Monticello Village - Monticello, MN | Maximum
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
Same-Store | Northridge - Bismarck, 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					884
Buildings & Improvements					7,515
Costs capitalized subsequent to acquisition					278
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,057
Buildings & Improvements					7,620
Total		$ 8,677			8,677
Accumulated Depreciation		(1,342)			(1,342)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		8,677
Deductions during year [Abstract]
Balance at close of year		$ 1,342
Same-Store | Northridge - Bismarck, ND | Minimum
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
Same-Store | Northridge - Bismarck, ND | Maximum
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
Same-Store | Olympic Village - Billings, MT
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					9,533
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					4,031
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,836
Buildings & Improvements					13,800
Total		$ 15,636			15,636
Accumulated Depreciation		(7,584)			(7,584)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		15,636
Deductions during year [Abstract]
Balance at close of year		$ 7,584
Same-Store | Olympic Village - Billings, MT | Minimum
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
Same-Store | Olympic Village - Billings, MT | Maximum
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
Same-Store | Olympik Village - 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					1,034
Buildings & Improvements					6,109
Costs capitalized subsequent to acquisition					2,805
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,450
Buildings & Improvements					8,498
Total		$ 9,948			9,948
Accumulated Depreciation		(3,790)			(3,790)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		9,948
Deductions during year [Abstract]
Balance at close of year		$ 3,790
Same-Store | Olympik Village - Rochester, MN | Minimum
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
Same-Store | Olympik Village - Rochester, MN | Maximum
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
Same-Store | Park Meadows - Waite Park, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					7,768
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					10,092
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					2,140
Buildings & Improvements					18,194
Total		$ 20,334			20,334
Accumulated Depreciation		(11,216)			(11,216)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		20,334
Deductions during year [Abstract]
Balance at close of year		$ 11,216
Same-Store | Park Meadows - Waite Park, MN | Minimum
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
Same-Store | Park Meadows - Waite Park, MN | Maximum
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
Same-Store | Park Place - Plymouth, 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					10,609
Buildings & Improvements					80,781
Costs capitalized subsequent to acquisition					7,280
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					10,782
Buildings & Improvements					87,888
Total		$ 98,670			98,670
Accumulated Depreciation		(7,255)			(7,255)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		98,670
Deductions during year [Abstract]
Balance at close of year		$ 7,255
Same-Store | Park Place - Plymouth, MN | Minimum
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
Same-Store | Park Place - Plymouth, MN | Maximum
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
Same-Store | Plaza - Minot, 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					867
Buildings & Improvements					12,784
Costs capitalized subsequent to acquisition					3,069
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,002
Buildings & Improvements					15,718
Total		$ 16,720			16,720
Accumulated Depreciation		(5,063)			(5,063)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		16,720
Deductions during year [Abstract]
Balance at close of year		$ 5,063
Same-Store | Plaza - Minot, ND | Minimum
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
Same-Store | Plaza - Minot, ND | Maximum
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
Same-Store | Pointe West - Rapid City, SD
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					240
Buildings & Improvements					3,538
Costs capitalized subsequent to acquisition					2,140
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					463
Buildings & Improvements					5,455
Total		$ 5,918			5,918
Accumulated Depreciation		(3,548)			(3,548)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		5,918
Deductions during year [Abstract]
Balance at close of year		$ 3,548
Same-Store | Pointe West - Rapid City, SD | Minimum
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
Same-Store | Pointe West - Rapid City, SD | Maximum
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
Same-Store | Ponds at Heritage Place - Sartell, 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					395
Buildings & Improvements					4,564
Costs capitalized subsequent to acquisition					492
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					419
Buildings & Improvements					5,032
Total		$ 5,451			5,451
Accumulated Depreciation		(1,327)			(1,327)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		5,451
Deductions during year [Abstract]
Balance at close of year		$ 1,327
Same-Store | Ponds at Heritage Place - Sartell, MN | Minimum
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
Same-Store | Ponds at Heritage Place - Sartell, MN | Maximum
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
Same-Store | Quarry Ridge - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					24,680
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					2,133
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					2,412
Buildings & Improvements					31,999
Total		$ 34,411			34,411
Accumulated Depreciation		(9,705)			(9,705)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		34,411
Deductions during year [Abstract]
Balance at close of year		$ 9,705
Same-Store | Quarry Ridge - Rochester, MN | Minimum
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
Same-Store | Quarry Ridge - Rochester, MN | Maximum
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
Same-Store | Red 20 - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					21,755
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					280
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,908
Buildings & Improvements					24,388
Total		$ 26,296			26,296
Accumulated Depreciation		(5,532)			(5,532)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		26,296
Deductions during year [Abstract]
Balance at close of year		$ 5,532
Same-Store | Red 20 - Minneapolis, MN | Minimum
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
Same-Store | Red 20 - Minneapolis, MN | Maximum
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
Same-Store | Regency Park Estates - St. Cloud, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					7,623
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					2,709
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,148
Buildings & Improvements					12,461
Total		$ 13,609			13,609
Accumulated Depreciation		(3,777)			(3,777)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		13,609
Deductions during year [Abstract]
Balance at close of year		$ 3,777
Same-Store | Regency Park Estates - St. Cloud, MN | Minimum
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
Same-Store | Regency Park Estates - St. Cloud, MN | Maximum
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
Same-Store | Rimrock West - Billings, MT
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					330
Buildings & Improvements					3,489
Costs capitalized subsequent to acquisition					2,096
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					543
Buildings & Improvements					5,372
Total		$ 5,915			5,915
Accumulated Depreciation		(2,930)			(2,930)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		5,915
Deductions during year [Abstract]
Balance at close of year		$ 2,930
Same-Store | Rimrock West - Billings, MT | Minimum
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
Same-Store | Rimrock West - Billings, MT | Maximum
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
Same-Store | River Ridge - Bismarck, 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					576
Buildings & Improvements					24,670
Costs capitalized subsequent to acquisition					1,078
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					936
Buildings & Improvements					25,388
Total		$ 26,324			26,324
Accumulated Depreciation		(7,027)			(7,027)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		26,324
Deductions during year [Abstract]
Balance at close of year		$ 7,027
Same-Store | River Ridge - Bismarck, ND | Minimum
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
Same-Store | River Ridge - Bismarck, ND | Maximum
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
Same-Store | Rocky Meadows - Billings, MT
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					656
Buildings & Improvements					5,726
Costs capitalized subsequent to acquisition					1,651
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					840
Buildings & Improvements					7,193
Total		$ 8,033			8,033
Accumulated Depreciation		(4,370)			(4,370)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		8,033
Deductions during year [Abstract]
Balance at close of year		$ 4,370
Same-Store | Rocky Meadows - Billings, MT | Minimum
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
Same-Store | Rocky Meadows - Billings, MT | Maximum
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
Same-Store | Rum River - Isanti, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					3,141
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					536
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					870
Buildings & Improvements					5,332
Total		$ 6,202			6,202
Accumulated Depreciation		(1,927)			(1,927)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		6,202
Deductions during year [Abstract]
Balance at close of year		$ 1,927
Same-Store | Rum River - Isanti, MN | Minimum
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
Same-Store | Rum River - Isanti, MN | Maximum
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
Same-Store | Silver Springs - Rapid City, SD
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					2,043
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					974
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					267
Buildings & Improvements					3,929
Total		$ 4,196			4,196
Accumulated Depreciation		(772)			(772)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		4,196
Deductions during year [Abstract]
Balance at close of year		$ 772
Same-Store | Silver Springs - Rapid City, SD | Minimum
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
Same-Store | Silver Springs - Rapid City, SD | Maximum
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
Same-Store | South Pointe - Minot, 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					550
Buildings & Improvements					9,548
Costs capitalized subsequent to acquisition					5,834
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,445
Buildings & Improvements					14,487
Total		$ 15,932			15,932
Accumulated Depreciation		(9,239)			(9,239)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		15,932
Deductions during year [Abstract]
Balance at close of year		$ 9,239
Same-Store | South Pointe - Minot, ND | Minimum
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
Same-Store | South Pointe - Minot, ND | Maximum
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
Same-Store | Southpoint - 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					576
Buildings & Improvements					9,893
Costs capitalized subsequent to acquisition					227
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					666
Buildings & Improvements					10,030
Total		$ 10,696			10,696
Accumulated Depreciation		(1,919)			(1,919)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		10,696
Deductions during year [Abstract]
Balance at close of year		$ 1,919
Same-Store | Southpoint - Grand Forks, ND | Minimum
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
Same-Store | Southpoint - Grand Forks, ND | Maximum
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
Same-Store | Southwind - 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					400
Buildings & Improvements					4,938
Costs capitalized subsequent to acquisition					4,627
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					929
Buildings & Improvements					9,036
Total		$ 9,965			9,965
Accumulated Depreciation		(5,347)			(5,347)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		9,965
Deductions during year [Abstract]
Balance at close of year		$ 5,347
Same-Store | Southwind - Grand Forks, ND | Minimum
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
Same-Store | Southwind - Grand Forks, ND | Maximum
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
Same-Store | Sunset Trail - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					7,310
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					3,430
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					785
Buildings & Improvements					15,795
Total		$ 16,580			16,580
Accumulated Depreciation		(8,294)			(8,294)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		16,580
Deductions during year [Abstract]
Balance at close of year		$ 8,294
Same-Store | Sunset Trail - Rochester, MN | Minimum
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
Same-Store | Sunset Trail - Rochester, MN | Maximum
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
Same-Store | Thomasbrook - Lincoln, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					13,100
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					5,451
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,708
Buildings & Improvements					14,649
Total		$ 16,357			16,357
Accumulated Depreciation		(7,648)			(7,648)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		16,357
Deductions during year [Abstract]
Balance at close of year		$ 7,648
Same-Store | Thomasbrook - Lincoln, NE | Minimum
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
Same-Store | Thomasbrook - Lincoln, NE | Maximum
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
Same-Store | Valley Park - 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					294
Buildings & Improvements					4,137
Costs capitalized subsequent to acquisition					4,243
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,323
Buildings & Improvements					7,351
Total		$ 8,674			8,674
Accumulated Depreciation		(4,498)			(4,498)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		8,674
Deductions during year [Abstract]
Balance at close of year		$ 4,498
Same-Store | Valley Park - Grand Forks, ND | Minimum
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
Same-Store | Valley Park - Grand Forks, ND | Maximum
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
Same-Store | Village Green - 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					234
Buildings & Improvements					2,296
Costs capitalized subsequent to acquisition					1,056
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					361
Buildings & Improvements					3,225
Total		$ 3,586			3,586
Accumulated Depreciation		(1,528)			(1,528)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		3,586
Deductions during year [Abstract]
Balance at close of year		$ 1,528
Same-Store | Village Green - Rochester, MN | Minimum
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
Same-Store | Village Green - Rochester, MN | Maximum
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
Same-Store | West Stonehill - Waite Park, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					16,425
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					7,932
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,903
Buildings & Improvements					17,135
Total		$ 19,038			19,038
Accumulated Depreciation		(10,848)			(10,848)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		19,038
Deductions during year [Abstract]
Balance at close of year		$ 10,848
Same-Store | West Stonehill - Waite Park, MN | Minimum
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
Same-Store | West Stonehill - Waite Park, MN | Maximum
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
Same-Store | Whispering Ridge - Omaha, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					20,120
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					1,858
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					2,459
Buildings & Improvements					26,962
Total		$ 29,421			29,421
Accumulated Depreciation		(6,573)			(6,573)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		29,421
Deductions during year [Abstract]
Balance at close of year		$ 6,573
Same-Store | Whispering Ridge - Omaha, NE | Minimum
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
Same-Store | Whispering Ridge - Omaha, NE | Maximum
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
Same-Store | Winchester - 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					748
Buildings & Improvements					5,622
Costs capitalized subsequent to acquisition					2,676
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,104
Buildings & Improvements					7,942
Total		$ 9,046			9,046
Accumulated Depreciation		(3,942)			(3,942)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		9,046
Deductions during year [Abstract]
Balance at close of year		$ 3,942
Same-Store | Winchester - Rochester, MN | Minimum
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
Same-Store | Winchester - Rochester, MN | Maximum
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
Same-Store | Woodridge - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					5,411
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					4,161
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					752
Buildings & Improvements					9,807
Total		$ 10,559			10,559
Accumulated Depreciation		(5,566)			(5,566)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		10,559
Deductions during year [Abstract]
Balance at close of year		$ 5,566
Same-Store | Woodridge - Rochester, MN | Minimum
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
Same-Store | Woodridge - Rochester, MN | Maximum
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
Same-Store | Oxbo - St Paul, MN | Minimum
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
Same-Store | Oxbo - St Paul, MN | Maximum
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
Same-Store | Wholly Owned Properties
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Multifamily and Other	$ 0	$ 168,504	$ 369,332	$ 61,565
Non-Same-Store
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					21,675
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land					56,559
Buildings & Improvements					382,516
Costs capitalized subsequent to acquisition					4,653
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					56,627
Buildings & Improvements					387,094
Total		443,721			443,721
Accumulated Depreciation		(19,818)			(19,818)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		443,721
Deductions during year [Abstract]
Balance at close of year		19,818
Non-Same-Store | Dylan - Denver, CO
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					77,215
Costs capitalized subsequent to acquisition					870
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					12,217
Buildings & Improvements					78,023
Total		90,240			90,240
Accumulated Depreciation		(5,536)			(5,536)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		90,240
Deductions during year [Abstract]
Balance at close of year		$ 5,536
Non-Same-Store | Dylan - Denver, CO | Minimum
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
Non-Same-Store | Dylan - Denver, CO | Maximum
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
Non-Same-Store | FreightYard Townhomes & Flats - Minneapolis, 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					1,889
Buildings & Improvements					23,616
Costs capitalized subsequent to acquisition					124
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					1,895
Buildings & Improvements					23,734
Total		$ 25,629			25,629
Accumulated Depreciation		$ (289)			(289)
Life on which depreciation in latest income statement is computed		30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		$ 25,629
Deductions during year [Abstract]
Balance at close of year		289
Non-Same-Store | Lugano at Cherry Creek - Denver, CO
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					7,679
Buildings & Improvements					87,766
Costs capitalized subsequent to acquisition					103
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					7,679
Buildings & Improvements					87,869
Total		95,548			95,548
Accumulated Depreciation		$ (1,075)			(1,075)
Life on which depreciation in latest income statement is computed		30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		$ 95,548
Deductions during year [Abstract]
Balance at close of year		1,075
Non-Same-Store | Oxbo - St Paul, 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					5,809
Buildings & Improvements					51,586
Costs capitalized subsequent to acquisition					176
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					5,809
Buildings & Improvements					51,755
Total		57,564			57,564
Accumulated Depreciation		(5,096)			(5,096)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		57,564
Deductions during year [Abstract]
Balance at close of year		$ 5,096
Non-Same-Store | Oxbo - St Paul, MN | Minimum
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
Non-Same-Store | Oxbo - St Paul, MN | Maximum
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
Non-Same-Store | SouthFork Townhomes - Lakeville, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					21,675
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land					3,502
Buildings & Improvements					40,153
Costs capitalized subsequent to acquisition					2,883
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					3,502
Buildings & Improvements					43,036
Total		$ 46,538			46,538
Accumulated Depreciation		$ (1,433)			(1,433)
Life on which depreciation in latest income statement is computed		30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		$ 46,538
Deductions during year [Abstract]
Balance at close of year		1,433
Non-Same-Store | Westend - Denver, CO
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					497
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					25,525
Buildings & Improvements					102,677
Total		128,202			128,202
Accumulated Depreciation		(6,389)			(6,389)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		128,202
Deductions during year [Abstract]
Balance at close of year		$ 6,389
Non-Same-Store | Westend - Denver, CO | Minimum
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
Non-Same-Store | Westend - Denver, CO | Maximum
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
Multifamily
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					331,376
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land					134,338
Buildings & Improvements					1,311,461
Costs capitalized subsequent to acquisition					163,679
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					153,302
Buildings & Improvements					1,456,169
Total		$ 1,609,471			1,609,471
Accumulated Depreciation		(339,274)			(339,274)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		1,609,471
Deductions during year [Abstract]
Balance at close of year		339,274
Other - Mixed Use
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					389
Buildings & Improvements					18,920
Costs capitalized subsequent to acquisition					5,197
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					601
Buildings & Improvements					23,905
Total		24,506			24,506
Accumulated Depreciation		(5,646)			(5,646)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		24,506
Deductions during year [Abstract]
Balance at close of year		5,646
Other - Mixed Use | 71 France - Edina, 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					0
Buildings & Improvements					5,879
Costs capitalized subsequent to acquisition					885
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					0
Buildings & Improvements					6,764
Total		6,764			6,764
Accumulated Depreciation		(873)			(873)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		6,764
Deductions during year [Abstract]
Balance at close of year		$ 873
Other - Mixed Use | 71 France - Edina, MN | Minimum
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 | 71 France - Edina, MN | Maximum
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 | Plaza - Minot, 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					389
Buildings & Improvements					5,444
Costs capitalized subsequent to acquisition					3,839
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					601
Buildings & Improvements					9,071
Total		$ 9,672			9,672
Accumulated Depreciation		(3,899)			(3,899)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		9,672
Deductions during year [Abstract]
Balance at close of year		$ 3,899
Other - Mixed Use | Plaza - Minot, ND | Minimum
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 | Plaza - Minot, ND | Maximum
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 | Red 20 - Minneapolis, 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					0
Buildings & Improvements					2,525
Costs capitalized subsequent to acquisition					419
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					0
Buildings & Improvements					2,944
Total		$ 2,944			2,944
Accumulated Depreciation		(541)			(541)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		2,944
Deductions during year [Abstract]
Balance at close of year		$ 541
Other - Mixed Use | Red 20 - Minneapolis, MN | Minimum
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 | Red 20 - Minneapolis, MN | Maximum
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 | Lugano at Cherry Creek - Denver, CO
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					1,600
Costs capitalized subsequent to acquisition					0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					0
Buildings & Improvements					1,600
Total		$ 1,600			1,600
Accumulated Depreciation		(18)			(18)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		1,600
Deductions during year [Abstract]
Balance at close of year		$ 18
Other - Mixed Use | Lugano at Cherry Creek - Denver, CO | Minimum
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 | Oxbo - St Paul, 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					0
Buildings & Improvements					3,472
Costs capitalized subsequent to acquisition					54
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					0
Buildings & Improvements					3,526
Total		$ 3,526			3,526
Accumulated Depreciation		(315)			(315)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		3,526
Deductions during year [Abstract]
Balance at close of year		$ 315
Other - Mixed Use | Oxbo - St Paul, MN | Minimum
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 | Oxbo - St Paul, MN | Maximum
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 | 3100 10th St SW - Minot, ND | Minimum
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
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					754
Buildings & Improvements					8,311
Costs capitalized subsequent to acquisition					36
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					768
Buildings & Improvements					8,333
Total		$ 9,101			9,101
Accumulated Depreciation		(4,202)			(4,202)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		9,101
Deductions during year [Abstract]
Balance at close of year		4,202
Other - Commercial | 3100 10th St SW - Minot, 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					246
Buildings & Improvements					1,866
Costs capitalized subsequent to acquisition					(1)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					246
Buildings & Improvements					1,865
Total		2,111			2,111
Accumulated Depreciation		(41)			(41)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		2,111
Deductions during year [Abstract]
Balance at close of year		41
Other - Commercial | Dakota West Plaza - Minot , 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					92
Buildings & Improvements					493
Costs capitalized subsequent to acquisition					37
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					106
Buildings & Improvements					516
Total		622			622
Accumulated Depreciation		(202)			(202)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		622
Deductions during year [Abstract]
Balance at close of year		$ 202
Other - Commercial | Dakota West Plaza - Minot , ND | Minimum
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 | Dakota West Plaza - Minot , ND | Maximum
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 | Minot IPS - Minot, 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					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		(3,959)			(3,959)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		6,368
Deductions during year [Abstract]
Balance at close of year		$ 3,959
Other - Commercial | Minot IPS - Minot, ND | Minimum
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 | Minot IPS - Minot, ND | Maximum
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
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances					331,376
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land					135,481
Buildings & Improvements					1,338,692
Costs capitalized subsequent to acquisition					168,912
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Land					154,671
Buildings & Improvements					1,488,407
Total		$ 1,643,078			1,643,078
Accumulated Depreciation		(349,122)			$ (349,122)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year		1,643,078
Deductions during year [Abstract]
Balance at close of year		$ 349,122