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SUBSEQUENT EVENTS (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Apr. 30, 2014
sqft
Apr. 30, 2013
May 22, 2014
Subsequent Event [Member]
Bismarck, North Dakota [Member]
acre
Apr. 30, 2014
Subsequent Event [Member]
Bismarck, North Dakota [Member]
Unit
Apr. 30, 2014
Subsequent Event [Member]
Golden Valley, Minnesota [Member]
Apr. 30, 2014
Subsequent Event [Member]
Edina, Minnesota [Member]
Unit
sqft
Jun. 05, 2014
Subsequent Event [Member]
Brooklyn Park, Minnesota [Member]
acre
May 19, 2014
Subsequent Event [Member]
Dewey Hill Business Center Edina MN [Member]
Property
Jun. 02, 2014
Subsequent Event [Member]
Rapid City, South Dakota [Member]
Unit
Apr. 30, 2014
Subsequent Event [Member]
Common Shares and Limited Partnership Units [Member]
Apr. 30, 2014
Subsequent Event [Member]
Series A Preferred Stock [Member]
Apr. 30, 2014
Subsequent Event [Member]
Series B Preferred Stock [Member]
Subsequent Event [Line Items]                        
Quarterly amount per share or unit (in dollars per share)                   $ 0.1300 $ 0.5156 $ 0.4968
Record Date                   Jun. 16, 2014 Jun. 16, 2014 Jun. 16, 2014
Payment Date                   Jul. 01, 2014 Jun. 30, 2014 Jun. 30, 2014
Number of units acquired                 204      
Purchase price of acquired property     $ 4,300,000 $ 8,500,000     $ 2,600,000   $ 18,300,000      
Area of land (in acres)     35.0       10.5          
Area of property (square feet) 5,500,000                      
Sales Price of Property Disposed         4,800,000     3,100,000        
Cash paid for acquisition of property 38,200,000 76,020,000 4,300,000       2,600,000          
Debt assumed                 12,200,000      
Number of units       68                
Number of office properties sold               1        
Number of units pending development           246            
Square footage of pending development (in square feet)           21,000            
Cost of pending development           $ 69,900,000            
Interest in joint venture (in hundredths)           50.50%