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SUBSEQUENT EVENTS (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012
Subsequent Event [Line Items] |  |  |  |
Shares issued |  |  | $ 2,846,000 | $ 3,413,000
Common stock, dividends, per share, declared (in dollars per share) | $ 0.1300 | $ 0.1300 | $ 0.3900 | $ 0.4315
Sales price |  |  | 10,173,000 | 2,175,000
Proceeds from sale of property |  |  | 3,909,000 | 2,088,000
Omaha, Nebraska [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash paid for acquisition of property | 28,300,000 |  | 28,300,000 |
Rapid City, South Dakota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash paid for acquisition of property | 2,800,000 |  | 2,800,000 |
Equity paid for acquisition of property | 3,400,000 |  | 3,400,000 |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) | $ 13.00 |  |  |
Subsequent Event [Member] | Williston Apartments, Williston, North Dakota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Estimated cost of construction | 62,400,000 |  | 62,400,000 |
Interest in joint venture (in hundredths) | 70.00% |  | 70.00% |
Number of buildings | 5 |  | 5 |
Area of land (in acres) | 14.5 |  | 14.5 |
Area of vacant land acquired (in acres) | 40 |  | 40 |
Number of property unit | 288 |  | 288 |
Subsequent Event [Member] | Bismarck, North Dakota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Area of land (in acres) | 18.2 |  | 18.2 |
Cash paid for acquisition of property | 3,300,000 |  | 3,300,000 |
Subsequent Event [Member] | Vacant land in Minot, North Dakota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Area of land (in acres) | 0.7 |  | 0.7 |
Cash paid for acquisition of property | 172,000 |  | 172,000 |
Subsequent Event [Member] | Omaha, Nebraska [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of buildings | 9 |  | 9 |
Area of land (in acres) | 18.5 |  | 18.5 |
Number of property unit | 336 |  | 336 |
Subsequent Event [Member] | Rapid City, South Dakota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Purchase price of acquired property | 6,200,000 |  | 6,200,000 |
Area of land (in acres) | 3.5 |  | 3.5 |
Number of property unit | 71 |  | 71 |
Subsequent Event [Member] | Vacant land in Grand Forks, North Dakota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Area of land (in acres) | 10 |  | 10 |
Cash paid for acquisition of property | $ 1,600,000 |  | $ 1,600,000 |

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