ACQUISITIONS AND DISPOSITIONS (Details) (USD $) Share data in Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014		Apr. 30, 2013		Apr. 30, 2012
Significant Acquisitions and Disposals [Line Items]
Transaction costs expensed during the period	$ 176,000		$ 434,000
Sales price	80,883,000		26,273,000
Project costs incurred to date	116,096,000	[1]
Acquisitions and development projects placed in service [Abstract]
Acquisition costs	43,580,000		108,241,000
Form of Consideration Cash	38,200,000		76,020,000
Form of Consideration Units (1)	3,480	[2]	12,632	[2]
Form of Consideration Other (2)	1,900,000	[3]	19,589,000	[4]
Investment Allocation Land	8,034,000		29,361,000
Investment Allocation Buildings	34,646,000		77,316,000
Investment Allocation Intangible assets	900,000		1,564,000
Assumed Debt	0		12,500,000.000		7,190,000.000
Project costs incurred to date	116,096,000	[1]
Results of operations from acquired properties [Abstract]
Total revenue	1,897,000		6,497,000
Net income	(82,000)		(66,000)
Dispositions [Abstract]
Sale price	80,883,000		26,273,000
Book value and sales cost	73,884,000		19,388,000
Gain/(Loss)	6,999,000		6,885,000
Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	3,510,000		8,850,000
Acquisitions and development projects placed in service [Abstract]
Acquisition costs	19,600,000		85,734,000
Form of Consideration Cash	16,120,000		62,602,000
Form of Consideration Units (1)	3,480	[2]	10,632	[2]
Form of Consideration Other (2)	0	[3]	12,500,000	[4]
Investment Allocation Land	1,447,000		6,854,000
Investment Allocation Buildings	17,635,000		77,316,000
Investment Allocation Intangible assets	518,000		1,564,000
Dispositions [Abstract]
Sale price	3,510,000		8,850,000
Book value and sales cost	3,738,000		5,272,000
Gain/(Loss)	(228,000)		3,578,000
Commercial Healthcare [Member]
Acquisitions and development projects placed in service [Abstract]
Acquisition costs	18,913,000
Form of Consideration Cash	18,913,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	1,520,000
Investment Allocation Buildings	17,011,000
Investment Allocation Intangible assets	382,000
Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	61,138,000
Dispositions [Abstract]
Sale price	61,138,000
Book value and sales cost	52,079,000
Gain/(Loss)	9,059,000
Commercial Office [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	12,950,000
Dispositions [Abstract]
Sale price	12,950,000
Book value and sales cost	14,504,000
Gain/(Loss)	(1,554,000)
Commercial Retail [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	3,285,000
Dispositions [Abstract]
Sale price	3,285,000
Book value and sales cost	3,563,000
Gain/(Loss)	(278,000)
Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Acquisition costs	5,067,000		22,507,000
Form of Consideration Cash	3,167,000		13,418,000
Form of Consideration Units (1)	0	[2]	2,000	[2]
Form of Consideration Other (2)	1,900,000	[3]	7,089,000	[4]
Investment Allocation Land	5,067,000		22,507,000
Investment Allocation Buildings	0		0
Investment Allocation Intangible assets	0		0
Other Disposition [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price			698,000
Dispositions [Abstract]
Sale price			698,000
Book value and sales cost			757,000
Gain/(Loss)			(59,000)
API Building Duluth MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	2,553,000
Dispositions [Abstract]
Date disposed	Sep. 24, 2013
Sale price	2,553,000
Book value and sales cost	1,488,000
Gain/(Loss)	1,065,000
Area of a real estate property (in square feet)	35,000
Alps Park - Rapid City, SD [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	May 01, 2013
Acquisition costs	6,200,000
Form of Consideration Cash	2,920,000
Form of Consideration Units (1)	3,280	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	287,000
Investment Allocation Buildings	5,551,000
Investment Allocation Intangible assets	362,000
Number of apartment units	71
Anoka Strip Center Anoka MN [Member] | Commercial Retail [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	325,000
Dispositions [Abstract]
Date disposed	Dec. 23, 2013
Sale price	325,000
Book value and sales cost	347,000
Gain/(Loss)	(22,000)
Area of a real estate property (in square feet)	10,625
Arcata - Golden Valley, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Apr. 30, 2013
Acquisition costs			2,088,000
Form of Consideration Cash			2,088,000
Form of Consideration Units (1)			0	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			2,088,000
Investment Allocation Buildings			0
Investment Allocation Intangible assets			0
Badger Hills Rochester, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Dec. 14, 2012	[5]
Acquisition costs			1,050,000	[5]
Form of Consideration Cash			1,050,000	[5]
Form of Consideration Units (1)			0	[2],[5]
Form of Consideration Other (2)			0	[4],[5]
Investment Allocation Land			1,050,000	[5]
Investment Allocation Buildings			0	[5]
Investment Allocation Intangible assets			0	[5]
Bismarck 4916 - Bismarck, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Apr. 12, 2013
Acquisition costs			3,250,000
Form of Consideration Cash			3,250,000
Form of Consideration Units (1)			0	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			3,250,000
Investment Allocation Buildings			0
Investment Allocation Intangible assets			0
Bloomington Business Plaza Bloomington MN [Member] | Commercial Office [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	4,500,000
Dispositions [Abstract]
Date disposed	Sep. 12, 2013
Sale price	4,500,000
Book value and sales cost	7,339,000
Gain/(Loss)	(2,839,000)
Area of a real estate property (in square feet)	121,669
Bodycote Industrial Building Eden Prairie MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	3,150,000
Dispositions [Abstract]
Date disposed	May 13, 2013
Sale price	3,150,000
Book value and sales cost	1,375,000
Gain/(Loss)	1,775,000
Area of a real estate property (in square feet)	41,880
Brooklyn Park 7401 Boone Avenue Brooklyn Park MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	12,800,000
Dispositions [Abstract]
Date disposed	Sep. 12, 2013
Sale price	12,800,000
Book value and sales cost	12,181,000
Gain/(Loss)	619,000
Area of a real estate property (in square feet)	322,751
Burnsville 2 Strip Center Burnsville MN [Member] | Commercial Retail [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	650,000
Dispositions [Abstract]
Date disposed	Jan. 08, 2014
Sale price	650,000
Book value and sales cost	796,000
Gain/(Loss)	(146,000)
Area of a real estate property (in square feet)	8,400
Candlelight - Fargo, ND [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price			1,950,000
Dispositions [Abstract]
Date disposed			Nov. 27, 2012
Sale price			1,950,000
Book value and sales cost			1,178,000
Gain/(Loss)			772,000
Number of apartment units			66
Cedar Lake Business Center St Louis Park MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	2,550,000
Dispositions [Abstract]
Date disposed	Sep. 12, 2013
Sale price	2,550,000
Book value and sales cost	2,607,000
Gain/(Loss)	(57,000)
Area of a real estate property (in square feet)	50,400
Chateau II - Minot, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	May 21, 2013
Acquisition costs	179,000
Form of Consideration Cash	179,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	179,000
Investment Allocation Buildings	0
Investment Allocation Intangible assets	0
Clive 2075 NW 94th Street Clive IA [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	2,735,000
Dispositions [Abstract]
Date disposed	Jan. 30, 2014
Sale price	2,735,000
Book value and sales cost	2,675,000
Gain/(Loss)	60,000
Area of a real estate property (in square feet)	42,510
Colony - Lincoln, NE [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Jun. 04, 2012
Acquisition costs			17,500,000
Form of Consideration Cash			14,368,000
Form of Consideration Units (1)			3,132	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			1,515,000
Investment Allocation Buildings			15,731,000
Investment Allocation Intangible assets			254,000
Number of apartment units			232
Commons at Southgate - Minot, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Jan. 22, 2013	[6]
Acquisition costs			3,691,000	[6]
Form of Consideration Cash			0	[6]
Form of Consideration Units (1)			0	[2],[6]
Form of Consideration Other (2)			3,691,000	[4],[6]
Investment Allocation Land			3,691,000	[6]
Investment Allocation Buildings			0	[6]
Investment Allocation Intangible assets			0
Interest in joint venture (in hundredths)			51.00%	[6]
JV Partner Contributions			3.691	[6]
Cypress Court - St. Cloud, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Aug. 10, 2012	[7]
Acquisition costs			447,000	[7]
Form of Consideration Cash			447,000	[7]
Form of Consideration Units (1)			0	[2],[7]
Form of Consideration Other (2)			0	[4],[7]
Investment Allocation Land			447,000	[7]
Investment Allocation Buildings			0	[7]
Investment Allocation Intangible assets			0	[7]
Interest in joint venture (in hundredths)			86.10%	[7]
Cypress Court Apartment Development St. Cloud, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Aug. 10, 2012	[7]
Acquisition costs			1,136,000	[7]
Form of Consideration Cash			0	[7]
Form of Consideration Units (1)			0	[2],[7]
Form of Consideration Other (2)			1,136,000	[4],[7]
Investment Allocation Land			1,136,000	[7]
Investment Allocation Buildings			0	[7]
Investment Allocation Intangible assets			0	[7]
Interest in joint venture (in hundredths)			86.10%	[7]
JV Partner Contributions			1.136	[7]
Dixon Avenue Industrial Park Des Moines IA [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	14,675,000
Dispositions [Abstract]
Date disposed	Oct. 31, 2013
Sale price	14,675,000
Book value and sales cost	10,328,000
Gain/(Loss)	4,347,000
Area of a real estate property (in square feet)	606,006
Eagan Community Eagan MN [Member] | Commercial Retail [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	2,310,000
Dispositions [Abstract]
Date disposed	May 14, 2013
Sale price	2,310,000
Book value and sales cost	2,420,000
Gain/(Loss)	(110,000)
Area of a real estate property (in square feet)	23,187
East Park Sioux Falls SD [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	2,214,000
Dispositions [Abstract]
Date disposed	Dec. 18, 2013
Sale price	2,214,000
Book value and sales cost	2,358,000
Gain/(Loss)	(144,000)
Number of apartment units	84
Fargo 1320 45th St N Fargo ND [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	4,700,000
Dispositions [Abstract]
Date disposed	May 13, 2013
Sale price	4,700,000
Book value and sales cost	4,100,000
Gain/(Loss)	600,000
Area of a real estate property (in square feet)	42,244
Georgetown Square Condominiums 5 and 6 [Member] | Other Disposition [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price			330,000
Dispositions [Abstract]
Date disposed			Jun. 21, 2012
Sale price			330,000
Book value and sales cost			336,000
Gain/(Loss)			(6,000)
Georgetown Square Condominiums 3 and 4 [Member] | Other Disposition [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price			368,000
Dispositions [Abstract]
Date disposed			Aug. 02, 2012
Sale price			368,000
Book value and sales cost			421,000
Gain/(Loss)			(53,000)
Grand Forks Grand Forks, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Dec. 31, 2012
Acquisition costs			4,278,000
Form of Consideration Cash			2,278,000
Form of Consideration Units (1)			2,000	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			4,278,000
Investment Allocation Buildings			0
Investment Allocation Intangible assets			0
Grand Forks 2150 Grand Forks, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Mar. 25, 2013
Acquisition costs			1,600,000
Form of Consideration Cash			1,600,000
Form of Consideration Units (1)			0	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			1,600,000
Investment Allocation Buildings			0
Investment Allocation Intangible assets			0
Isanti Unimproved - Isanti, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Feb. 04, 2014
Acquisition costs	50,000
Form of Consideration Cash	50,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	50,000
Investment Allocation Buildings	0
Investment Allocation Intangible assets	0
Jamestown Unimproved - Jamestown, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Aug. 09, 2013
Acquisition costs	700,000
Form of Consideration Cash	700,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	700,000
Investment Allocation Buildings	0
Investment Allocation Intangible assets	0
Kentwood Thomasville Kentwood, MI [Member] | Commercial Retail [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price			625,000
Dispositions [Abstract]
Date disposed			Jun. 20, 2012
Sale price			625,000
Book value and sales cost			692,000
Gain/(Loss)			(67,000)
Area of a real estate property (in square feet)			16,080
Lakeside Village - Lincoln, NE [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Jun. 04, 2012
Acquisition costs			17,250,000
Form of Consideration Cash			13,954,000
Form of Consideration Units (1)			3,296	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			1,215,000
Investment Allocation Buildings			15,837,000
Investment Allocation Intangible assets			198,000
Number of apartment units			208
Landing at Southgate - Minot, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Jan. 22, 2013	[6]
Acquisition costs			2,262,000	[6]
Form of Consideration Cash			0	[6]
Form of Consideration Units (1)			0	[2],[6]
Form of Consideration Other (2)			2,262,000	[4],[6]
Investment Allocation Land			2,262,000	[6]
Investment Allocation Buildings			0
Investment Allocation Intangible assets			0
Interest in joint venture (in hundredths)			51.00%	[6]
JV Partner Contributions			2.262	[6]
Legends at Heritage Place - Sartell, MN [Member] | Commercial Healthcare [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Oct. 31, 2013
Acquisition costs	11,863,000
Form of Consideration Cash	11,863,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	970,000
Investment Allocation Buildings	10,511,000
Investment Allocation Intangible assets	382,000
Area of a real estate property (in square feet)	98,174
Legends at Heritage Place - Sartell, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Oct. 31, 2013
Acquisition costs	537,000
Form of Consideration Cash	537,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	537,000
Investment Allocation Buildings	0
Investment Allocation Intangible assets	0
Lighthouse Duluth MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	1,825,000
Dispositions [Abstract]
Date disposed	Oct. 08, 2013
Sale price	1,825,000
Book value and sales cost	1,547,000
Gain/(Loss)	278,000
Area of a real estate property (in square feet)	59,292
Metal Improvement Company New Brighton MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	2,350,000
Dispositions [Abstract]
Date disposed	May 13, 2013
Sale price	2,350,000
Book value and sales cost	1,949,000
Gain/(Loss)	401,000
Area of a real estate property (in square feet)	49,620
Minnetonka 13600 County Road 62 Minnetonka MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	3,800,000
Dispositions [Abstract]
Date disposed	Jan. 30, 2014
Sale price	3,800,000
Book value and sales cost	3,084,000
Gain/(Loss)	716,000
Area of a real estate property (in square feet)	69,984
Minot (Southgate Lot 4) - Minot, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Jan. 11, 2013
Acquisition costs			1,882,000
Form of Consideration Cash			1,882,000
Form of Consideration Units (1)			0	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			1,882,000
Investment Allocation Buildings			0
Investment Allocation Intangible assets			0
Nicollett VII Burnsville MN [Member] | Commercial Office [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	7,290,000
Dispositions [Abstract]
Date disposed	Sep. 12, 2013
Sale price	7,290,000
Book value and sales cost	6,001,000
Gain/(Loss)	1,289,000
Area of a real estate property (in square feet)	118,125
Pinecone Villas - Sartell, MN [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Oct. 31, 2013
Acquisition costs	2,800,000
Form of Consideration Cash	2,800,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	584,000
Investment Allocation Buildings	2,191,000
Investment Allocation Intangible assets	25,000
Number of apartment units	24
Pillsbury Business Center Bloomington MN [Member] | Commercial Office [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	1,160,000
Dispositions [Abstract]
Date disposed	Sep. 12, 2013
Sale price	1,160,000
Book value and sales cost	1,164,000
Gain/(Loss)	(4,000)
Area of a real estate property (in square feet)	42,929
Prairiewood Meadows - Fargo, ND [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price			3,450,000
Dispositions [Abstract]
Date disposed			Sep. 27, 2012
Sale price			3,450,000
Book value and sales cost			2,846,000
Gain/(Loss)			604,000
Number of apartment units			85
Ponds at Heritage Place - Sartell, MN [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Oct. 10, 2012
Acquisition costs			5,020,000
Form of Consideration Cash			3,332,000
Form of Consideration Units (1)			1,688	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			395,000
Investment Allocation Buildings			4,564,000
Investment Allocation Intangible assets			61,000
Number of apartment units			58
Rapid City Unimproved- Rapid City, SD [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Mar. 25, 2014
Acquisition costs	1,366,000
Form of Consideration Cash	1,366,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	1,366,000
Investment Allocation Buildings	0
Investment Allocation Intangible assets	0
RED 20 - Minneapolis, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Aug. 20, 2013	[8]
Acquisition costs	1,900,000	[8]
Form of Consideration Cash	0	[8]
Form of Consideration Units (1)	0	[2],[8]
Form of Consideration Other (2)	1,900,000	[3],[8]
Investment Allocation Land	1,900,000	[8]
Investment Allocation Buildings	0	[8]
Investment Allocation Intangible assets	0	[8]
Interest in joint venture (in hundredths)	58.60%	[8]
JV Partner Contributions	1.900	[8]
Roseville 2929 Long Lake Road Roseville MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	9,275,000
Dispositions [Abstract]
Date disposed	May 13, 2013
Sale price	9,275,000
Book value and sales cost	9,998,000
Gain/(Loss)	(723,000)
Area of a real estate property (in square feet)	172,057
Southpoint - Grand Forks, ND [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Sep. 05, 2013
Acquisition costs	10,600,000
Form of Consideration Cash	10,400,000
Form of Consideration Units (1)	200	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	576,000
Investment Allocation Buildings	9,893,000
Investment Allocation Intangible assets	131,000
Number of apartment units	96
Spring Creek Fruitland - Fruitland, IA [Member] | Commercial Healthcare [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Feb. 05, 2014
Acquisition costs	7,050,000
Form of Consideration Cash	7,050,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	550,000
Investment Allocation Buildings	6,500,000
Investment Allocation Intangible assets	0
Area of a real estate property (in square feet)	39,500
Spring Creek Fruitland - Fruitland, IA [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired	Jan. 21, 2014
Acquisition costs	335,000
Form of Consideration Cash	335,000
Form of Consideration Units (1)	0	[2]
Form of Consideration Other (2)	0	[3]
Investment Allocation Land	335,000
Investment Allocation Buildings	0
Investment Allocation Intangible assets	0
Stevens Point Stevens Point WI [Member] | Commercial Healthcare [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price			16,100,000
Dispositions [Abstract]
Date disposed			Apr. 25, 2013
Sale price			16,100,000
Book value and sales cost			12,667,000
Gain/(Loss)			3,433,000
Area of a real estate property (in square feet)			47,950
Sycamore Village - Sioux Falls, SD [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	1,296,000
Dispositions [Abstract]
Date disposed	Dec. 18, 2013
Sale price	1,296,000
Book value and sales cost	1,380,000
Gain/(Loss)	(84,000)
Number of apartment units	48
Terrace on the Green Fargo, ND [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price			3,450,000
Dispositions [Abstract]
Date disposed			Sep. 27, 2012
Sale price			3,450,000
Book value and sales cost			1,248,000
Gain/(Loss)			2,202,000
Number of apartment units			116
University Commons Williston, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Aug. 01, 2012
Acquisition costs			823,000
Form of Consideration Cash			823,000
Form of Consideration Units (1)			0	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			823,000
Investment Allocation Buildings			0
Investment Allocation Intangible assets			0
Villa West - Topeka, KS [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			May 08, 2012
Acquisition costs			17,650,000
Form of Consideration Cash			5,150,000
Form of Consideration Units (1)			0	[2]
Form of Consideration Other (2)			12,500,000	[4]
Investment Allocation Land			1,590,000
Investment Allocation Buildings			15,760,000
Investment Allocation Intangible assets			300,000
Number of apartment units			308
Assumed Debt			12.500
Whispering Ridge - Omaha, NE [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Apr. 24, 2013
Acquisition costs			28,314,000
Form of Consideration Cash			25,798,000
Form of Consideration Units (1)			2,516	[2]
Form of Consideration Other (2)			0	[4]
Investment Allocation Land			2,139,000
Investment Allocation Buildings			25,424,000
Investment Allocation Intangible assets			751,000
Number of apartment units			336
Winsted Industrial Building Winsted MN [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Sales price	725,000
Dispositions [Abstract]
Date disposed	Jan. 17, 2014
Sale price	725,000
Book value and sales cost	747,000
Gain/(Loss)	(22,000)
Area of a real estate property (in square feet)	41,685
Development Projects Placed in Service [Member]
Acquisitions and development projects placed in service [Abstract]
Investment Allocation Land	3,987,000	[9]	2,133,000
Investment Allocation Buildings	49,560,000	[9]	45,786,000
Development costs of projects placed in service	53,547,000	[9]	47,919,000
Development Projects Placed in Service [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Investment Allocation Land	3,987,000	[9]	1,642,000
Investment Allocation Buildings	49,560,000	[9]	28,047,000
Development costs of projects placed in service	53,547,000	[9]	29,689,000
Development Projects Placed in Service [Member] | Commercial Healthcare [Member]
Acquisitions and development projects placed in service [Abstract]
Investment Allocation Land			0
Investment Allocation Buildings			11,090,000
Development costs of projects placed in service			11,090,000
Development Projects Placed in Service [Member] | Arrowhead First International Bank - Minot ND [Member] | Commercial Retail [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date			1,240,000	[10],[11]
Acquisitions and development projects placed in service [Abstract]
Date placed in service			Mar. 19, 2013	[10],[11]
Investment Allocation Land			75,000	[10],[11]
Investment Allocation Buildings			1,165,000	[10],[11]
Development costs of projects placed in service			1,240,000	[10],[11]
Area of a real estate property (in square feet)			3,702	[10]
Project costs incurred to date			1,240,000	[10],[11]
Development Costs, Period Cost			1,200,000	[10]	75,000	[10]
Development Projects Placed in Service [Member] | Cypress Court - St. Cloud, MN [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date	13,564,000	[12],[9]
Acquisitions and development projects placed in service [Abstract]
Date placed in service	Nov. 01, 2013	[12],[13],[9]
Investment Allocation Land	1,136,000	[12],[13],[9]
Investment Allocation Buildings	12,428,000	[12],[13],[9]
Development costs of projects placed in service	13,564,000	[12],[13],[9]
Number of apartment units	132	[12],[9]
Project costs incurred to date	13,564,000	[12],[9]
Development Costs, Period Cost	7,800,000	[12],[9]	5,800,000	[12],[9]
Development Projects Placed in Service [Member] | First Avenue - Minot ND [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date			2,677,000	[14],[15]
Acquisitions and development projects placed in service [Abstract]
Date placed in service			Apr. 15, 2013	[14],[15]
Investment Allocation Land			0	[14],[15]
Investment Allocation Buildings			2,677,000	[14],[15]
Development costs of projects placed in service			2,677,000	[14],[15]
Number of apartment units			20	[15]
Project costs incurred to date			2,677,000	[14],[15]
Development Costs, Period Cost			2,400,000	[15],[16],[9]	321,000	[15]
Development Projects Placed in Service [Member] | Jamestown Medical Office Building - Jamestown, ND [Member] | Commercial Healthcare [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date			7,605,000	[17],[18]
Acquisitions and development projects placed in service [Abstract]
Date placed in service			Jan. 01, 2013	[17],[18]
Investment Allocation Land			0	[17],[18]
Investment Allocation Buildings			7,605,000	[17],[18]
Development costs of projects placed in service			7,605,000	[17],[18]
Area of a real estate property (in square feet)			45,222	[17]
Project costs incurred to date			7,605,000	[17],[18]
Development Costs, Period Cost			6,600,000	[17]	1,000,000	[17]
Development Projects Placed in Service [Member] | Landing at Southgate - Minot, ND [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date	15,126,000	[19],[9]
Acquisitions and development projects placed in service [Abstract]
Date placed in service	Sep. 04, 2013	[19],[20],[9]
Investment Allocation Land	2,262,000	[19],[20],[9]
Investment Allocation Buildings	12,864,000	[19],[20],[9]
Development costs of projects placed in service	15,126,000	[19],[20],[9]
Number of apartment units	108	[19],[9]
Project costs incurred to date	15,126,000	[19],[9]
Development Costs, Period Cost	8,800,000	[19],[9]	6,300,000	[19],[9]
Development Projects Placed in Service [Member] | Minot IPS - Minot, ND [Member] | Commercial Industrial [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date			5,900,000	[21],[22]
Acquisitions and development projects placed in service [Abstract]
Date placed in service			Dec. 17, 2012	[21],[22]
Investment Allocation Land			416,000	[21],[22]
Investment Allocation Buildings			5,484,000	[21],[22]
Development costs of projects placed in service			5,900,000	[21],[22]
Area of a real estate property (in square feet)			27,698	[22]
Project costs incurred to date			5,900,000	[21],[22]
Development Costs, Period Cost			4,100,000	[22]	1,800,000	[22]
Development Projects Placed in Service [Member] | Quarry Ridge II - Rochester, MN [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date			17,578,000	[20],[23]
Acquisitions and development projects placed in service [Abstract]
Date placed in service			Jun. 29, 2012	[20],[23]
Investment Allocation Land			942,000	[20],[23]
Investment Allocation Buildings			16,636,000	[20],[23]
Development costs of projects placed in service			17,578,000	[20],[23]
Number of apartment units			159	[23]
Project costs incurred to date			17,578,000	[20],[23]
Development Costs, Period Cost			4,600,000	[19],[23],[9]	13,000,000	[23]
Development Projects Placed in Service [Member] | River Ridge - Bismarck, ND [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date	24,857,000	[16],[9]
Acquisitions and development projects placed in service [Abstract]
Date placed in service	Dec. 02, 2013	[14],[16],[9]
Investment Allocation Land	589,000	[14],[16],[9]
Investment Allocation Buildings	24,268,000	[14],[16],[9]
Development costs of projects placed in service	24,857,000	[14],[16],[9]
Number of apartment units	146	[16],[9]
Project costs incurred to date	24,857,000	[16],[9]
Development Costs, Period Cost	14,800,000	[16],[9]	10,100,000	[16],[9]
Development Projects Placed in Service [Member] | Spring Wind Expansion Laramie, WY [Member] | Commercial Healthcare [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date			3,485,000	[24],[25]
Acquisitions and development projects placed in service [Abstract]
Date placed in service			Nov. 16, 2012	[24],[25]
Investment Allocation Land			0	[24],[25]
Investment Allocation Buildings			3,485,000	[24],[25]
Development costs of projects placed in service			3,485,000	[24],[25]
Area of a real estate property (in square feet)			26,662	[24]
Project costs incurred to date			3,485,000	[24],[25]
Development Costs, Period Cost			1,700,000	[24]	1,800,000	[24]
Development Projects Placed in Service [Member] | Williston Garden Buildings 3 and 4 Williston, ND [Member] | Multi-Family Residential [Member]
Significant Acquisitions and Disposals [Line Items]
Project costs incurred to date			9,434,000	[13],[26]
Acquisitions and development projects placed in service [Abstract]
Date placed in service			Jul. 31, 2012	[13],[26]
Investment Allocation Land			700,000	[13],[26]
Investment Allocation Buildings			8,734,000	[13],[26]
Development costs of projects placed in service			9,434,000	[13],[26]
Number of apartment units			73	[26]
Project costs incurred to date			9,434,000	[13],[26]
Development Costs, Period Cost			$ 7,000,000	[26],[9]	$ 2,400,000	[26]

[1] Includes costs related to development projects that are placed in service in phases (Renaissance Heights I - $11.5 million).

[2] Value of limited partnership units of the Operating Partnership at the acquisition date.

[3] Consists of value of land contributed by the joint venture partner.

[4] Consists of assumed debt (Villa West - $12.5 million) and value of land contributed by the joint venture partner (Cypress Court - $1.1 million, Commons at Southgate - $3.7 million, Landing at Southgate - $2.3 million).

[5] Acquisition of unimproved land consisted of two parcels acquired separately on December 14 and December 20, 2012, respectively.

[6] Land is owned by a joint venture entity in which the Company has an approximately 51% interest. The joint venture is consolidated in IRET’s financial statements.

[7] Land is owned by a joint venture in which the Company has an approximately 86.1% interest. The joint venture is consolidated in IRET’s financial statements.

[8] Land is owned by a joint venture in which the Company has an approximately 58.6% interest. The joint venture is consolidated in IRET’s financial statements.

[9] Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 15 for additional information on the Renaissance Heights I project, which was partially placed in service during the three months ended April 30, 2014.

[10] Development property placed in service March 19, 2013. Costs paid in fiscal year 2012 totaled approximately 75,000. Additional costs paid in fiscal year 2013 totaled $1.2 million, for a total project cost at April 30, 2013 of $1.2 million.

[11] Development property placed in service March 19, 2013. Additional costs paid in fiscal year 2012 totaled approximately $75,000, for a total project cost at April 30, 2013 of $1.2 million.

[12] Development property placed in service November 1, 2013. Costs paid in fiscal year 2013 totaled $5.8 million. Additional costs paid in fiscal year 2014 totaled $7.8 million, for a total project cost at April 30, 2014 of $13.6 million. The project is owned by a joint venture entity in which the Company has an approximately 86.1% interest.

[13] Development property placed in service July 31, 2012. Buildings 1 and 2 were placed in service in fiscal year 2012. Additional costs paid in fiscal year 2012 totaled $12.0 million, for a total project cost at April 30, 2013 of $19.1 million.

[14] Redevelopment property placed in service April 15, 2013. Additional costs paid in fiscal years 2012 and 2011 totaled approximately $321,000, for a total project cost at April 30, 2013 of $2.7 million.

[15] Redevelopment property placed in service April 15, 2013. Costs paid in fiscal years 2011 and 2012 totaled approximately $321,000. Additional costs paid in fiscal year 2013 totaled $2.4 million, for a total project cost at April 30, 2013 of $2.7 million.

[16] Development property placed in service December 2, 2013. Costs paid in fiscal year 2013 totaled $10.1 million, including the land acquired in fiscal year 2009. Additional costs paid in fiscal year 2014 totaled $14.8 million, for a total project cost at April 30, 2014 of $24.9 million.

[17] Development property placed in service January 1, 2013. Costs paid in fiscal year 2012 totaled $1.0 million. Additional costs paid in fiscal year 2013 totaled $6.6 million, for a total project cost at April 30, 2013 of $7.6 million. The project is owned by a joint venture entity in which the Company has an approximately 51% interest.

[18] Development property placed in service January 1, 2013. Additional costs paid in fiscal year 2012 totaled $1.0 million, for a total project cost at April 30, 2013 of $7.6 million.

[19] Development property placed in service September 4, 2013. Costs paid in fiscal year 2013 totaled $6.3 million. Additional costs paid in fiscal year 2014 totaled $8.8 million, for a total project cost at April 20, 2014 of $15.1 million. The project is owned by a joint venture entity in which the Company has an approximately 51% interest.

[20] Development property placed in service June 29, 2012. Additional costs paid in fiscal years 2012 and 2011, and land acquired in fiscal year 2007, totaled $13.0 million, for a total project cost at April 30, 2013 of $17.6 million.

[21] Development property placed in service December 17, 2012. Additional costs paid in fiscal year 2012 totaled $1.8 million, for a total project cost at April 30, 2013 of $5.9 million.

[22] Development property placed in service December 17, 2012. Costs paid in fiscal year 2012 totaled $1.8 million. Additional costs paid in fiscal year 2013 totaled $4.1 million, for a total project cost at April 30, 2013 of $5.9 million.

[23] Development property placed in service June 29, 2012. Costs paid in fiscal years 2011 and 2012 totaled $13.0 million, including land acquired in fiscal year 2007. Additional costs paid in fiscal year 2013 totaled $4.6 million, for a total project cost at April 30, 2013 of $17.6 million.

[24] Expansion project placed in service November 16, 2012. Costs paid in fiscal year 2012 totaled $1.8 million. Additional costs paid in fiscal year 2013 totaled $1.7 million, for a total project cost at April 30, 2013 of $3.5 million.

[25] Expansion project placed in service November 16, 2012. Additional costs paid in fiscal year 2012 totaled $1.8 million, for a total project cost at April 30, 2013 of $3.5 million.

[26] Development property placed in service July 31, 2012. Buildings 1 and 2 were placed in service in fiscal year 2012. Costs paid in fiscal year 2012 for Buildings 3 and 4 totaled $2.4 million. Additional costs paid in fiscal year 2013 totaled $7.0 million, for a total project cost at April 30, 2013 of $9.4 million. The project is owned by a joint venture entity in which the Company has an approximately 60% interest.