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SUBSEQUENT EVENTS (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2012 | Oct. 31, 2011 | Oct. 31, 2012 | Oct. 31, 2011
Subsequent Event [Line Items] |  |  |  |
Shares issued |  |  | $ 2,846,000 | $ 773,000
Common stock, dividends, per share, declared (in dollars per share) | $ 0.1300 | $ 0.1300 | $ 0.2600 | $ 0.3015
Sales price |  |  | 8,223,000 |
Proceeds from sale of property |  |  | 3,267,000 | 2,088,000
Subsequent Event [Member] | Multi-family residential property in Topeka, Kansas [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Sales price |  |  | 2,000,000 |
Buyer's assumption of the existing mortgage debt | 1,200,000 |  | 1,200,000 |
Proceeds from sale of property |  |  | 701,000 |
Number of buildings | 12 |  | 12 |
Area of land (in acres) | 5.9 |  | 5.9 |
Number of property unit | 116 |  | 116 |
Cash paid for acquisition of property | 7,600,000 |  | 7,600,000 |
Subsequent Event [Member] | Multi-family residential property in Omaha, Nebraska [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of buildings | 9 |  | 9 |
Purchase price of acquired property | 28,600,000 |  | 28,600,000 |
Area of land (in acres) | 18.5 |  | 18.5 |
Number of property unit | 336 |  | 336 |
Subsequent Event [Member] | Adjoining parcels of vacant land in Rochester, Minnesota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Purchase price of acquired property | 1,100,000 |  | 1,100,000 |
Area of land (in acres) | 24 |  | 24 |
Number of property unit | 2 |  | 2 |
Subsequent Event [Member] | Vacant land in Grand Forks, North Dakota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Purchase price of acquired property | 1,600,000 |  | 1,600,000 |
Area of land (in acres) | 10 |  | 10 |
Number of property unit | 2 |  | 2 |
Subsequent Event [Member] | Vacant land in Rapid City, South Dakota [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Purchase price of acquired property | $ 879,000 |  | $ 879,000 |
Area of land (in acres) | 9 |  | 9 |

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