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COMMITMENTS AND CONTINGENCIES, Development, Expansion and Renovation Projects (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2015 USD ($) ft² Unit
Real Estate Properties [Line Items] |  |
Anticipated Total Cost | $ 292,765 |
Project costs incurred to date | 208,982 | [1]
Other [Member] |  |
Real Estate Properties [Line Items] |  |
Project costs incurred to date | $ 6,618 | [1]
Multi Family Residential [Member] | Chateau II - Minot, ND [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | Unit | 72 |
Anticipated Total Cost | $ 14,711 |
Project costs incurred to date | $ 13,129 | [1]
Estimated quarter for completion | 1 |
Estimated year for completion | 2016 |
Multi Family Residential [Member] | Renaissance Heights - Williston ND [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | Unit | 288 | [2]
Anticipated Total Cost | $ 62,362 | [2]
Project costs incurred to date | $ 59,087 | [1],[2]
Estimated quarter for completion | 1 | [2]
Estimated year for completion | 2016 | [2]
Interest in joint venture (in hundredths) | 70.00% |
Costs related to development projects placed in service in phases | $ 46,000 |
Multi Family Residential [Member] | Deer Ridge - Jamestown, ND [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | Unit | 163 |
Anticipated Total Cost | $ 24,519 |
Project costs incurred to date | $ 15,355 | [1]
Estimated quarter for completion | 2 |
Estimated year for completion | 2016 |
Multi Family Residential [Member] | Cardinal Point - Grand Forks, ND [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | Unit | 251 |
Anticipated Total Cost | $ 40,042 |
Project costs incurred to date | $ 26,450 | [1]
Estimated quarter for completion | 3 |
Estimated year for completion | 2016 |
Multi Family Residential [Member] | 71 France Phase I, II, III - Edina, MN [Member] |  |
Real Estate Properties [Line Items] |  |
Area of real estate property | ft² | 21,772 |
Number of apartment units | Unit | 241 | [3]
Anticipated Total Cost | $ 73,290 | [3]
Project costs incurred to date | $ 35,137 | [1],[3]
Estimated quarter for completion | 1 | [3]
Estimated year for completion | 2017 | [3]
Interest in joint venture (in hundredths) | 52.60% |
Commercial Healthcare [Member] | Edina 6565 France SMC III - Edina, MN [Member] |  |
Real Estate Properties [Line Items] |  |
Area of real estate property | ft² | 57,479 |
Anticipated Total Cost | $ 36,752 |
Project costs incurred to date | $ 22,549 | [1]
Estimated quarter for completion | 1 |
Estimated year for completion | 2016 |
Commercial Healthcare [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] |  |
Real Estate Properties [Line Items] |  |
Area of real estate property | ft² | 72,895 |
Anticipated Total Cost | $ 24,251 |
Project costs incurred to date | $ 19,457 | [1]
Estimated quarter for completion | 2 |
Estimated year for completion | 2016 |
Other Property [Member] | Roseville 3075 Long Lake Rd - Roseville, MN [Member] |  |
Real Estate Properties [Line Items] |  |
Area of real estate property | ft² | 202,807 |
Anticipated Total Cost | $ 13,915 |
Project costs incurred to date | $ 9,036 |
Other Property [Member] | Minot Southgate Retail Minot ND [Member] |  |
Real Estate Properties [Line Items] |  |
Area of real estate property | ft² | 7,963 |
Anticipated Total Cost | $ 2,923 |
Project costs incurred to date | $ 2,164 |
Estimated quarter for completion | 1 |
Estimated year for completion | 2016 |
[1] | Includes costs related to development projects that are placed in service in phases (Renaissance Heights - $46.0 million).
[2] | The Company is an approximately 70% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.
[3] | The project will be constructed in three phases by a joint venture entity in which the Company has an approximately 52.6% interest. The anticipated total cost amount given in the table above is the total cost to the joint venture entity. The anticipated total cost includes approximately 21,772 square feet of retail space.

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