ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY ACQUISITIONS (Details)		6 Months Ended
		Oct. 31, 2015 USD ($) ft² Unit	Oct. 31, 2014 USD ($) Unit
Business Acquisition [Line Items]
Transaction costs expensed during the period		$ 153,000	$ 104,000
Acquisitions and development projects placed in service [Abstract]
Total Acquisition Cost		71,750,000	36,738,000
Form of Consideration, Cash		71,350,000	23,056,000
Form of Consideration, Units	[1]	400,000	100,000
Form of Consideration, Other	[2]		13,582,000
Investment Allocation, Land		6,424,000	11,712,000
Investment Allocation, Building		64,144,000	24,661,000
Investment Allocation, Intangible Assets		1,182,000	365,000
Goodwill, acquired during period		0	852,000
Results of operations from acquired properties [Abstract]
Total revenue		268,000	1,003,000
Net income (loss)		(219,000)	(38,000)
Multifamily [Member]
Acquisitions and development projects placed in service [Abstract]
Total Acquisition Cost		65,250,000	26,780,000
Form of Consideration, Cash		64,850,000	14,511,000
Form of Consideration, Units	[1]	400,000	100,000
Form of Consideration, Other	[2]		12,169,000
Investment Allocation, Land		5,521,000	1,754,000
Investment Allocation, Building		59,035,000	24,661,000
Investment Allocation, Intangible Assets		$ 694,000	$ 365,000
Multifamily [Member] | 74 unit - Gardens - Grand Forks, ND [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired		Sep. 10, 2015
Total Acquisition Cost		$ 9,250,000
Form of Consideration, Cash		8,850,000
Form of Consideration, Units	[1]	400,000
Investment Allocation, Land		518,000
Investment Allocation, Building		8,672,000
Investment Allocation, Intangible Assets		$ 60,000
Number of units | Unit		74
Multifamily [Member] | 276 unit - GrandeVille at Cascade Lake - Rochester, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired		Oct. 29, 2015
Total Acquisition Cost		$ 56,000,000
Form of Consideration, Cash		56,000,000
Form of Consideration, Units	[1]	0
Investment Allocation, Land		5,003,000
Investment Allocation, Building		50,363,000
Investment Allocation, Intangible Assets		$ 634,000
Number of units | Unit		276
Multifamily [Member] | 152 unit - Homestead Garden - Rapid City, SD [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired	[3]		Jun. 02, 2014
Total Acquisition Cost	[3]		$ 15,000,000
Form of Consideration, Cash	[3]		5,092,000
Form of Consideration, Units	[1],[3]		0
Form of Consideration, Other	[2],[3]		9,908,000
Investment Allocation, Land	[3]		655,000
Investment Allocation, Building	[3]		14,139,000
Investment Allocation, Intangible Assets	[3]		$ 206,000
Number of units | Unit	[3]		152
Goodwill, acquired during period			$ 852,000
Assumed debt			$ 9,900,000
Multifamily [Member] | 52 unit - Silver Springs - Rapid City, SD [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired			Jun. 02, 2014
Total Acquisition Cost			$ 3,280,000
Form of Consideration, Cash			1,019,000
Form of Consideration, Units	[1]		0
Form of Consideration, Other	[2]		2,261,000
Investment Allocation, Land			215,000
Investment Allocation, Building			3,006,000
Investment Allocation, Intangible Assets			$ 59,000
Number of units | Unit			52
Assumed debt			$ 2,300,000
Multifamily [Member] | 68 unit - Northridge - Bismarck, ND [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired			Sep. 12, 2014
Total Acquisition Cost			$ 8,500,000
Form of Consideration, Cash			8,400,000
Form of Consideration, Units	[1]		100,000
Form of Consideration, Other	[2]		0
Investment Allocation, Land			884,000
Investment Allocation, Building			7,516,000
Investment Allocation, Intangible Assets			$ 100,000
Number of units | Unit			68
Commercial Healthcare [Member] | 27,819 sq ft Lakeside Medical Plaza - Omaha, NE [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired		Aug. 20, 2015
Total Acquisition Cost		$ 6,500,000
Form of Consideration, Cash		6,500,000
Form of Consideration, Units	[1]	0
Investment Allocation, Land		903,000
Investment Allocation, Building		5,109,000
Investment Allocation, Intangible Assets		$ 488,000
Area of real estate property | ft²		27,819
Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Total Acquisition Cost			$ 9,958,000
Form of Consideration, Cash			8,545,000
Form of Consideration, Units	[1]		0
Form of Consideration, Other	[2]		1,413,000
Investment Allocation, Land			9,958,000
Investment Allocation, Building			0
Investment Allocation, Intangible Assets			$ 0
Unimproved Land [Member] | Creekside Crossing - Bismarck, ND [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired			May 22, 2014
Total Acquisition Cost			$ 4,269,000
Form of Consideration, Cash			4,269,000
Form of Consideration, Units	[1]		0
Form of Consideration, Other	[2]		0
Investment Allocation, Land			4,269,000
Investment Allocation, Building			0
Investment Allocation, Intangible Assets			$ 0
Unimproved Land [Member] | PrairieCare Medical - Brooklyn Park, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired			Jun. 05, 2014
Total Acquisition Cost			$ 2,616,000
Form of Consideration, Cash			2,616,000
Form of Consideration, Units	[1]		0
Form of Consideration, Other	[2]		0
Investment Allocation, Land			2,616,000
Investment Allocation, Building			0
Investment Allocation, Intangible Assets			$ 0
Unimproved Land [Member] | 71 France Phase I - Edina, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired	[4]		Jun. 12, 2014
Total Acquisition Cost	[4]		$ 1,413,000
Form of Consideration, Cash	[4]		0
Form of Consideration, Units	[1],[4]		0
Form of Consideration, Other	[2],[4]		1,413,000
Investment Allocation, Land	[4]		1,413,000
Investment Allocation, Building	[4]		0
Investment Allocation, Intangible Assets	[4]		$ 0
Interest held percentage			52.60%
JV partner contributions			$ 1,400,000
Unimproved Land [Member] | Monticello 7th Addition - Monticello, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquired			Oct. 09, 2014
Total Acquisition Cost			$ 1,660,000
Form of Consideration, Cash			1,660,000
Form of Consideration, Units	[1]		0
Form of Consideration, Other	[2]		0
Investment Allocation, Land			1,660,000
Investment Allocation, Building			0
Investment Allocation, Intangible Assets			$ 0

[1] Value of Units of the Operating Partnership at the acquisition date.

[2] Consists of assumed debt (Homestead Garden I - $9.9 million, Silver Springs - $2.3 million) and value of land contributed by the joint venture partner (71 France - $1.4 million).

[3] At acquisition, we adjusted the assumed debt to fair value and recognized approximately $852,000 of goodwill.

[4] Land was contributed to a joint venture in which we have an approximately 52.6% interest. The joint venture is consolidated in our financial statements.