ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, ACQUISITIONS (Details) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Business Acquisition [Line Items]
Transaction costs expensed during the period		$ 253,000
Acquisitions and development projects placed in service [Abstract]
Partnership units issued		18,226,000	$ 800,000
Gain on bargain purchase		3,424,000
Results of operations from acquired properties [Abstract]
Total revenue		4,094,000
Net loss		(366,000)
Acquisitions Member
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs	$ 0	143,500,000
Form of consideration, cash		121,850,000
Form of consideration, units		18,226,000
Investment allocation, land		10,259,000
Investment allocation, building		131,159,000
Investment allocation, intangible assets		2,082,000
Acquisitions Member | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		137,000,000
Form of consideration, cash		115,350,000
Form of consideration, units		18,226,000
Investment allocation, land		9,356,000
Investment allocation, building		126,050,000
Investment allocation, intangible assets		$ 1,594,000
Acquisitions Member | Multi-Family Residential [Member] | 74 unit - Gardens - Grand Forks, ND [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired		Sep. 10, 2015
Total acquisition costs		$ 9,250,000
Form of consideration, cash		8,850,000
Form of consideration, units		400,000
Investment allocation, land		518,000
Investment allocation, building		8,672,000
Investment allocation, intangible assets		60,000
Partnership units issued		$ 44,000
Acquisitions Member | Multi-Family Residential [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 costs		$ 56,000,000
Form of consideration, cash		56,000,000
Investment allocation, land		5,003,000
Investment allocation, building		50,363,000
Investment allocation, intangible assets		$ 634,000
Acquisitions Member | Multi-Family Residential [Member] | 187 unit - Avalon Cove - Rochester, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired		Mar. 22, 2016
Total acquisition costs		$ 36,250,000
Form of consideration, cash		15,000,000
Form of consideration, units		17,826,000
Investment allocation, land		1,616,000
Investment allocation, building		34,145,000
Investment allocation, intangible assets		489,000
Partnership units issued		$ 2,500,000
Acquisitions Member | Multi-Family Residential [Member] | 90 unit - Cascade Shores - Rochester, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired		Mar. 22, 2016
Total acquisition costs		$ 18,500,000
Form of consideration, cash		18,500,000
Investment allocation, land		1,585,000
Investment allocation, building		16,710,000
Investment allocation, intangible assets		$ 205,000
Acquisitions Member | Multi-Family Residential [Member] | 76 unit - Crystal Bay - Rochester, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired		Mar. 22, 2016
Total acquisition costs		$ 12,000,000
Form of consideration, cash		12,000,000
Investment allocation, land		433,000
Investment allocation, building		11,425,000
Investment allocation, intangible assets		$ 142,000
Acquisitions Member | Multi-Family Residential [Member] | 40-unit - French Creek - Rochester, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired		Mar. 22, 2016
Total acquisition costs		$ 5,000,000
Form of consideration, cash		5,000,000
Investment allocation, land		201,000
Investment allocation, building		4,735,000
Investment allocation, intangible assets		$ 64,000
Acquisitions Member | 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 costs		$ 6,500,000
Form of consideration, cash		6,500,000
Investment allocation, land		903,000
Investment allocation, building		5,109,000
Investment allocation, intangible assets		$ 488,000