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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, ACQUISITIONS (Details) - USD ($) | 12 Months Ended
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Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |
Transaction costs expensed during the period |  | $ 253,000 |  | $ 216,000 |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Partnership units issued |  | 18,226,000 |  | 800,000 |  | $ 3,480,000
Gain on bargain purchase |  | 3,424,000 |  |  |  |
Goodwill, acquired during period |  |  |  | 852,000 |  |
Results of operations from acquired properties [Abstract] |  |  |  |  |  |
Total revenue |  | 4,094,000 |  | 2,565,000 |  |
Net loss |  | (366,000) |  | (1,000) |  |
74 unit - Gardens - Grand Forks, ND [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Partnership units issued |  | 44,000 |  |  |  |
187 unit - Avalon Cove - Rochester, MN [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Partnership units issued |  | 2,500,000 |  |  |  |
Northridge - Bismarck, ND [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Partnership units issued |  |  |  | 11,000 |  |
Legacy Heights - Bismarck, ND [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Partnership units issued |  |  |  | 77,000 |  |
Acquisitions Member |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Total acquisition costs |  | 143,500,000 |  | 56,297,000 |  |
Form of consideration, cash |  | 121,850,000 |  | 38,606,000 |  |
Form of consideration, units |  | 18,226,000 | [1] | 800,000 | [2] |
Form of consideration, other | [3] |  |  | 16,891,000 |  |
Investment allocation, land |  | 10,259,000 |  | 17,478,000 |  |
Investment allocation, building |  | 131,159,000 |  | 38,403,000 |  |
Investment allocation, intangible assets |  | 2,082,000 |  | 416,000 |  |
Acquisitions Member | Multi-Family Residential [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Total acquisition costs |  | 137,000,000 |  | 41,780,000 |  |
Form of consideration, cash |  | 115,350,000 |  | 28,811,000 |  |
Form of consideration, units |  | 18,226,000 | [1] | 800,000 | [2] |
Form of consideration, other | [3] |  |  | 12,169,000 |  |
Investment allocation, land |  | 9,356,000 |  | 2,961,000 |  |
Investment allocation, building |  | 126,050,000 |  | 38,403,000 |  |
Investment allocation, intangible assets |  | $ 1,594,000 |  | $ 416,000 |  |
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 | [1] | 400,000 |  |  |  |
Investment allocation, land |  | 518,000 |  |  |  |
Investment allocation, building |  | 8,672,000 |  |  |  |
Investment allocation, intangible assets |  | $ 60,000 |  |  |  |
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 | [1] | 17,826,000 |  |  |  |
Investment allocation, land |  | 1,616,000 |  |  |  |
Investment allocation, building |  | 34,145,000 |  |  |  |
Investment allocation, intangible assets |  | $ 489,000 |  |  |  |
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 | Multi-Family Residential [Member] | 152 unit - Homestead Garden - Rapid City, SD [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired | [4] |  |  | Jun. 02, 2014 |  |
Total acquisition costs | [4] |  |  | $ 15,000,000 |  |
Form of consideration, cash | [4] |  |  | 5,092,000 |  |
Form of consideration, other | [3],[4] |  |  | 9,908,000 |  |
Investment allocation, land | [4] |  |  | 655,000 |  |
Investment allocation, building | [4] |  |  | 14,139,000 |  |
Investment allocation, intangible assets | [4] |  |  | $ 206,000 |  |
Acquisitions Member | Multi-Family Residential [Member] | 52 unit - Silver Springs - Rapid City, SD [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired |  |  |  | Jun. 02, 2014 |  |
Total acquisition costs |  |  |  | $ 3,280,000 |  |
Form of consideration, cash |  |  |  | 1,019,000 |  |
Form of consideration, other | [3] |  |  | 2,261,000 |  |
Investment allocation, land |  |  |  | 215,000 |  |
Investment allocation, building |  |  |  | 3,006,000 |  |
Investment allocation, intangible assets |  |  |  | 59,000 |  |
Acquisitions Member | Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Assumed debt |  |  |  | 9,900,000 |  |
Acquisitions Member | Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Assumed debt |  |  |  | $ 2,300,000 |  |
Acquisitions Member | Multi-Family Residential [Member] | Northridge - Bismarck, ND [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired |  |  |  | Sep. 12, 2014 |  |
Total acquisition costs |  |  |  | $ 8,500,000 |  |
Form of consideration, cash |  |  |  | 8,400,000 |  |
Form of consideration, units | [2] |  |  | 100,000 |  |
Investment allocation, land |  |  |  | 884,000 |  |
Investment allocation, building |  |  |  | 7,516,000 |  |
Investment allocation, intangible assets |  |  |  | $ 100,000 |  |
Acquisitions Member | Multi-Family Residential [Member] | Legacy Heights - Bismarck, ND [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired | [5] |  |  | Mar. 19, 2015 |  |
Total acquisition costs | [5] |  |  | $ 15,000,000 |  |
Form of consideration, cash | [5] |  |  | 14,300,000 |  |
Form of consideration, units | [2],[5] |  |  | 700,000 |  |
Investment allocation, land | [5] |  |  | 1,207,000 |  |
Investment allocation, building | [5] |  |  | 13,742,000 |  |
Investment allocation, intangible assets | [5] |  |  | 51,000 |  |
Land in development |  |  |  | 804,000 |  |
Building in development |  |  |  | 7,800,000 |  |
Ecsrow |  |  |  | 1,300,000 |  |
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 |  |  |  |
Acquisitions Member | Unimproved Land [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Total acquisition costs |  |  |  | 14,517,000 |  |
Form of consideration, cash |  |  |  | 9,795,000 |  |
Form of consideration, other | [3] |  |  | 4,722,000 |  |
Investment allocation, land |  |  |  | $ 14,517,000 |  |
Acquisitions Member | Unimproved Land [Member] | Creekside Crossing - Bismarck, ND [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired |  |  |  | May 22, 2014 |  |
Total acquisition costs |  |  |  | $ 4,269,000 |  |
Form of consideration, cash |  |  |  | 4,269,000 |  |
Investment allocation, land |  |  |  | $ 4,269,000 |  |
Acquisitions Member | Unimproved Land [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired |  |  |  | Jun. 05, 2014 |  |
Total acquisition costs |  |  |  | $ 2,616,000 |  |
Form of consideration, cash |  |  |  | 2,616,000 |  |
Investment allocation, land |  |  |  | $ 2,616,000 |  |
Acquisitions Member | Unimproved Land [Member] | 71 France Phase I - Edina, MN [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired | [6] |  |  | Jun. 12, 2014 |  |
Total acquisition costs | [6] |  |  | $ 1,413,000 |  |
Form of consideration, other | [3],[6] |  |  | 1,413,000 |  |
Investment allocation, land | [6] |  |  | $ 1,413,000 |  |
Acquisitions Member | Unimproved Land [Member] | Monticello 7th Addition - Monticello, MN [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired |  |  |  | Oct. 09, 2014 |  |
Total acquisition costs |  |  |  | $ 1,660,000 |  |
Form of consideration, cash |  |  |  | 1,660,000 |  |
Investment allocation, land |  |  |  | $ 1,660,000 |  |
Acquisitions Member | Unimproved Land [Member] | 71 France Phase 2 & 3 - Edina, MN [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired | [6] |  |  | Nov. 04, 2014 |  |
Total acquisition costs | [6] |  |  | $ 3,309,000 |  |
Form of consideration, other | [3],[6] |  |  | 3,309,000 |  |
Investment allocation, land | [6] |  |  | $ 3,309,000 |  |
Interest in joint venture (in hundredths) |  |  |  | 52.60% |  |
Acquisitions Member | Unimproved Land [Member] | 71 France Phases I, II & III |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
JV Partner Contributions |  |  |  | $ 4,700,000 |  |
Acquisitions Member | Unimproved Land [Member] | Minot 1525 24th Ave SW - Minot, ND [Member] |  |  |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |  |  |
Date acquired |  |  |  | Dec. 23, 2014 |  |
Total acquisition costs |  |  |  | $ 1,250,000 |  |
Form of consideration, cash |  |  |  | 1,250,000 |  |
Investment allocation, land |  |  |  | $ 1,250,000 |  |
[1] | Value of Units of the Operating Partnership based on the closing market price of our common stock on the acquisition date. The number of Units issued were approximately 44,000 and 2.5 million, respectively, for the Gardens and Avalon Cove acquisitions.Acquisition resulted in a gain on bargain purchase of approximately $3.4 million. See Note 2 for additional information.
[2] | Value of limited partnership units of the Operating Partnership
[3] | Consists of assumed debt (Homestead Garden I: $9.9 million, Silver Springs: $2.3 million) and value of land contributed by the joint venture partner (71 France: $4.7 million).
[4] | At acquisition, we adjusted the assumed debt to fair value and recognized approximately $852,000 of goodwill.
[5] | At acquisition, the purchase price included assets in development (land: $804,000, building: $7.8 million, escrow $1.3 million).
[6] | Land was contributed to a joint venture in which we have an approximately 52.6% interest. The joint venture is consolidated in our financial statements.

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