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SUBSEQUENT EVENTS (Details) (USD $) | 3 Months Ended |  | 3 Months Ended |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2013 Subsequent Event [Member] | Aug. 30, 2013 Subsequent Event [Member] | Jul. 31, 2013 Subsequent Event [Member] Anoka, Minnesota [Member] | Jul. 31, 2013 Subsequent Event [Member] Duluth, Minnesota [Member] | Jul. 31, 2013 Subsequent Event [Member] Sioux Falls, South Dakota, 1 [Member] | Jul. 31, 2013 Subsequent Event [Member] Sioux Falls, South Dakota, 2 [Member] | Jul. 31, 2013 Subsequent Event [Member] Minneapolis, Minnesota [Member] sqft | Jul. 31, 2013 Subsequent Event [Member] Grand Forks Grand Forks, ND [Member] | Aug. 09, 2013 Subsequent Event [Member] Jamestown, North Dakota [Member] acre | Jul. 31, 2013 Subsequent Event [Member] Sartell, Minnesota [Member] | Jul. 31, 2013 Subsequent Event [Member] Monticello, Minnesota [Member] acre | Jul. 31, 2013 Subsequent Event [Member] Rapid City, South Dakota 1 [Member] | Jul. 31, 2013 Subsequent Event [Member] Rapid City, South Dakota 1 [Member] Sioux Falls, South Dakota, 1 [Member] acre | Jul. 31, 2013 Subsequent Event [Member] Rapid City, South Dakota 2 [Member] | Jul. 31, 2013 Subsequent Event [Member] Rapid City, South Dakota 2 [Member] Sioux Falls, South Dakota, 2 [Member] acre | Jul. 31, 2013 Subsequent Event [Member] Series A Preferred Stock [Member] | Jul. 31, 2013 Subsequent Event [Member] Series A Preferred Stock [Member] Dividend Declared [Member] | Jul. 31, 2013 Subsequent Event [Member] Series B Preferred Stock [Member] | Jul. 31, 2013 Subsequent Event [Member] Series B Preferred Stock [Member] Dividend Declared [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, common shares and units (in dollars per share) | $ 0.1300 | $ 0.1300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, Redeemable Preferred Shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51.56 |  | $ 49.68
Dividends date declared |  |  | Sep. 04, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 04, 2013 |  | Sep. 04, 2013 |
Dividends date of record |  |  | Sep. 16, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 16, 2013 |  | Sep. 16, 2013 |
Dividends date to be paid |  |  | Oct. 01, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2013 |  | Sep. 30, 2013 |
Area of land (in acres) |  |  |  |  |  |  |  |  |  |  | 9.2 |  | 5.0 |  | 5.2 |  | 5.6 |  |  |  |
Area of property (square feet) |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Sales price of property |  |  |  |  | $ 325,000 | $ 1,800,000 | $ 2,200,000 | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of property |  |  |  |  |  |  |  |  |  |  | 700,000 | 15,200,000 | 656,000 | 657,000 |  | 707,000 |  |  |  |  |
Number of units |  |  |  |  |  |  |  |  | 130 | 251 |  | 121 |  |  |  |  |  |  |  |  |
Interest in joint venture (in hundredths) |  |  |  |  |  |  |  |  | 58.60% |  |  |  |  |  |  |  |  |  |  |  |
Interest in joint venture, remaining percentage (in hundredths) |  |  |  |  |  |  |  |  | 41.40% |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of construction |  |  |  |  |  |  |  |  | 29,000,000 | 39,000,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |
Construction loan for joint venture project |  |  |  |  |  |  |  |  | 21,700,000 | 14,500,000 |  |  |  |  |  |  |  |  |  |  |
Maximum value of shares of beneficial interest under the agreement |  |  |  | $ 75.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, under the agreement |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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