ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details)	3 Months Ended	6 Months Ended		12 Months Ended
	Jul. 31, 2016 USD ($)	Oct. 31, 2016 USD ($) item	Oct. 31, 2015 USD ($) ft² item	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)
Business Acquisition [Line Items]
Project costs incurred to date		$ 31,351,000
Impairment of real estate continuing and discontinued operations		54,153,000	$ 3,598,000
Development Projects Placed in Service [Member]
Business Acquisition [Line Items]
Land		4,721,000	6,819,000
Building		67,555,000	130,168,000
Development cost		$ 72,276,000	136,987,000
Development Projects Placed in Service [Member] | Multi-Family Residential [Member]
Business Acquisition [Line Items]
Land			3,320,000
Building			73,841,000
Development cost			$ 77,161,000
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		67,555,000
Development cost		$ 72,276,000
Number of apartment units | item		241
Development costs paid		$ 1,400,000		$ 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			59,440,000
Development cost			$ 62,520,000
Number of apartment units | item			288
Development costs paid			$ 4,800,000		57,700,000
Interest in joint venture (in hundredths)			71.50%
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			54,594,000
Development cost			$ 57,204,000
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			$ 32,495,000
Development cost			$ 32,495,000
Area of real estate property | ft²			57,624
Development costs paid			$ 11,700,000		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			22,099,000
Development cost			$ 24,709,000
Area of real estate property | ft²			70,756
Development costs paid			$ 7,400,000		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			1,733,000
Development cost			$ 2,622,000
Area of real estate property | ft²			7,963
Development costs paid			$ 500,000		$ 2,100,000