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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details) - Development Projects Placed in Service [Member] - USD ($) | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |
Land |  | $ 6,455,000 | [1] | $ 9,119,000 |
Building |  | 96,423,000 | [1] | 202,716,000 |
Development cost |  | $ 102,878,000 | [1] | 211,835,000 |
Multi-Family Residential [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Land |  |  |  | 5,620,000 |
Building |  |  |  | 146,111,000 |
Development cost |  |  |  | 151,731,000 |
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service | [1] | May 01, 2016 |  |  |
Land | [1] | $ 4,721,000 |  |  |
Building | [1] | 67,641,000 |  |  |
Development cost | [1] | 72,362,000 |  |  |
Development costs paid |  | 1,500,000 |  | 70,900,000 |
Project costs incurred to date |  | $ 72,400,000 |  |  |
Interest in joint venture (in hundredths) |  | 52.60% |  |  |
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service | [1] | Mar. 01, 2017 |  |  |
Land | [1] | $ 1,734,000 |  |  |
Building | [1] | 28,782,000 |  |  |
Development cost | [1] | 30,516,000 |  |  |
Development costs paid |  | 15,000,000 |  | $ 15,500,000 |
Project costs incurred to date |  | $ 30,500,000 |  |  |
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 |  |  |  | 14,408,000 |
Development cost |  |  |  | 14,648,000 |
Development costs paid |  |  |  | 2,300,000 | $ 12,300,000
Project costs incurred to date |  |  |  | $ 14,600,000 |
Multi-Family Residential [Member] | Renaissance Heights - Williston, ND [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service | [2] |  |  | Jul. 27, 2015 |
Land | [2] |  |  | $ 3,080,000 |
Building | [2] |  |  | 59,434,000 |
Development cost | [2] |  |  | 62,514,000 |
Development costs paid |  |  |  | 4,800,000 | 57,700,000
Project costs incurred to date |  |  |  | $ 62,500,000 |
Interest in joint venture (in hundredths) |  | 86.60% |  |  |
Multi-Family Residential [Member] | Deer Ridge - Jamestown, ND |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  |  | Feb. 22, 2016 |
Land |  |  |  | $ 700,000 |
Building |  |  |  | 24,137,000 |
Development cost |  |  |  | 24,837,000 |
Development costs paid |  |  |  | 10,500,000 | 14,300,000
Project costs incurred to date |  |  |  | $ 24,800,000 |
Multi-Family Residential [Member] | Cardinal Point - Grand Forks, ND |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  |  | Mar. 18, 2016 |
Land |  |  |  | $ 1,600,000 |
Building |  |  |  | 48,132,000 |
Development cost |  |  |  | 49,732,000 |
Development costs paid |  |  |  | 26,700,000 | 23,000,000
Project costs incurred to date |  |  |  | 49,700,000 |
Healthcare [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Land |  |  |  | 2,610,000 |
Building |  |  |  | 54,871,000 |
Development cost |  |  |  | $ 57,481,000 |
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 |  |  |  | $ 33,041,000 |
Development cost |  |  |  | 33,041,000 |
Development costs paid |  |  |  | 12,200,000 | 20,800,000
Project costs incurred to date |  |  |  | $ 33,000,000 |
Healthcare [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  |  | Sep. 08, 2015 |
Land |  |  |  | $ 2,610,000 |
Building |  |  |  | 21,830,000 |
Development cost |  |  |  | 24,440,000 |
Development costs paid |  |  |  | 7,100,000 | 17,300,000
Project costs incurred to date |  |  |  | $ 24,400,000 |
Other Member | Minot Southgate Retail - Minot, ND [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  |  | Oct. 01, 2015 |
Land |  |  |  | $ 889,000 |
Building |  |  |  | 1,734,000 |
Development cost |  |  |  | 2,623,000 |
Development costs paid |  |  |  | 500,000 | $ 2,100,000
Project costs incurred to date |  |  |  | $ 2,600,000 |
[1] | Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 15 for additional information on the 71 France project, which was partially placed in service during the fiscal year ended April 30, 2016.
[2] | Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 15 for additional information on the 71 France project, which was partially placed in service during the fiscal year ended April 30, 2016.Costs paid in prior fiscal years totaled $12.3 million. Additional costs incurred in fiscal year 2016 totaled $2.3 million, for a total project cost at April 30, 2016 of $14.6 million. Costs paid in prior fiscal years totaled $57.7 million. Additional costs incurred in fiscal year 2016 totaled $4.8 million, for a total project cost at April 30, 2016 of $62.5 million. The project is owned by a joint venture entity in which we currently have an approximately 86.6% interest. The joint venture is consolidated in our financial statements. Costs paid in prior fiscal years totaled $14.3 million. Additional costs incurred in fiscal year 2016 totaled $10.5 million, for a total project cost at April 30, 2016 of $24.8 million. Costs paid in prior fiscal years totaled $23.0 million. Additional costs incurred in fiscal year 2016 totaled $26.7 million, for a total project cost at April 30, 2016 of $49.7 million. Costs paid in prior fiscal years totaled $20.8 million. Additional costs incurred in fiscal year 2016 totaled $12.2 million, for a total project cost at April 30, 2016 of $33.0 million. Costs paid in prior fiscal years totaled $17.3 million. Additional costs incurred in fiscal year 2016 totaled $7.1 million, for a total project cost at April 30, 2016 of $24.4 million.Costs paid in prior fiscal years totaled $2.1 million. Additional costs incurred in fiscal year 2016 totaled approximately $500,000, for a total project cost at April 30, 2016 of $2.6 million.

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