ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details)	3 Months Ended	9 Months Ended		12 Months Ended
	Jul. 31, 2016 USD ($)	Jan. 31, 2017 USD ($) item	Jan. 31, 2016 USD ($) ft² item	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)
Business Acquisition [Line Items]
Project costs incurred to date		$ 32,506,000
Impairment of real estate continuing and discontinued operations		54,153,000	$ 3,760,000
Development Projects Placed in Service [Member]
Business Acquisition [Line Items]
Land		4,721,000	6,819,000
Building		67,642,000	129,979,000
Development cost		$ 72,363,000	136,798,000
Development Projects Placed in Service [Member] | Multi-Family Residential [Member]
Business Acquisition [Line Items]
Land			3,320,000
Building			73,772,000
Development cost			$ 77,092,000
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | 71 France - Edina, MN [Member]
Business Acquisition [Line Items]
Date placed in service		May 01, 2016
Land		$ 4,721,000
Building		67,642,000
Development cost		$ 72,363,000
Number of apartment units | item		241
Development costs paid		$ 1,500,000		$ 70,900,000
Interest in joint venture (in hundredths)		52.60%
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | 72 unit - Chateau II - Minot, ND [Member]
Business Acquisition [Line Items]
Date placed in service			Jun. 01, 2015
Land			$ 240,000
Building			14,401,000
Development cost			14,641,000
Number of apartment units | item		72
Development costs paid			$ 2,300,000		$ 12,300,000
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | 288 unit - Renaissance Heights - Williston, ND [Member]
Business Acquisition [Line Items]
Date placed in service			Jul. 27, 2015
Land			$ 3,080,000
Building			59,371,000
Development cost			$ 62,451,000
Number of apartment units | item			288
Development costs paid			$ 4,800,000		57,700,000
Interest in joint venture (in hundredths)			86.60%
Impairment of real estate continuing and discontinued operations	$ 36,700,000
Development Projects Placed in Service [Member] | Healthcare [Member]
Business Acquisition [Line Items]
Land			$ 2,610,000
Building			54,473,000
Development cost			$ 57,083,000
Development Projects Placed in Service [Member] | Healthcare [Member] | 57,624 sq ft Edina 6565 France SMC III - Edina, MN [Member]
Business Acquisition [Line Items]
Date placed in service			Jun. 01, 2015
Building			$ 32,725,000
Development cost			$ 32,725,000
Area of real estate property | ft²			57,624
Development costs paid			$ 11,900,000		20,800,000
Development Projects Placed in Service [Member] | Healthcare [Member] | PrairieCare Medical - Brooklyn Park, MN [Member]
Business Acquisition [Line Items]
Date placed in service			Sep. 08, 2015
Land			$ 2,610,000
Building			21,748,000
Development cost			$ 24,358,000
Area of real estate property | ft²			70,756
Development costs paid			$ 7,100,000		17,300,000
Development Projects Placed in Service [Member] | Other Member | Minot Southgate Retail - Minot, ND [Member]
Business Acquisition [Line Items]
Date placed in service			Oct. 01, 2015
Land			$ 889,000
Building			1,734,000
Development cost			$ 2,623,000
Area of real estate property | ft²			7,963
Development costs paid			$ 500,000		$ 2,100,000