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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, ACQUISITIONS (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2016 USD ($) | Oct. 31, 2016 USD ($) | Oct. 31, 2015 USD ($) ft² item
Acquisitions and development projects placed in service [Abstract] |  |  |
Partnership units issued |  |  | $ 400,000
Acquisitions Member |  |  |
Business Acquisition [Line Items] |  |  |
Transaction costs expensed during the period |  |  | 153,000
Acquisitions and development projects placed in service [Abstract] |  |  |
Total acquisition costs |  | $ 0 | 71,750,000
Form of consideration, cash |  |  | 71,350,000
Form of consideration, units |  |  | 400,000
Investment allocation, land |  |  | 6,424,000
Investment allocation, building |  |  | 64,144,000
Investment allocation, intangible assets |  |  | 1,182,000
Results of operations from acquired properties [Abstract] |  |  |
Total revenue |  |  | 268,000
Net loss |  |  | (219,000)
Acquisitions Member | Multi-Family Residential [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Total acquisition costs |  |  | 65,250,000
Form of consideration, cash |  |  | 64,850,000
Form of consideration, units |  |  | 400,000
Investment allocation, land |  |  | 5,521,000
Investment allocation, building |  |  | 59,035,000
Investment allocation, intangible assets |  |  | $ 694,000
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
Number of apartment units | item |  |  | 74
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
Number of apartment units | item |  |  | 276
Acquisitions Member | Multi-Family Residential [Member] | RED 20 - Minneapolis, MN [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Purchase price of minority interest in joint venture | $ 4,900,000 |  |
Interest in joint venture (in hundredths) | 41.41% | 41.41% |
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
Area of real estate property | ft² |  |  | 27,819

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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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