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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, ACQUISITIONS (Details) - USD ($) | 12 Months Ended
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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 |

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