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OPERATING SEGMENTS (Details)
$ in Thousands
 12 Months Ended
Apr. 30, 2016
Segment
Apr. 30, 2015
USD ($)
Segment
Apr. 30, 2014
USD ($)
Apr. 30, 2013
USD ($)
Apr. 30, 2012
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | Segment   5      
Segment revenues and net operating income [Abstract]          
Real estate revenue   $ 200,995 $ 185,379 $ 169,733  
Real estate expenses   73,833 69,805 62,170  
Gain on involuntary conversion   0 2,480 5,084  
Net operating income   127,162 118,054 112,647  
TRS senior housing revenue, net of expense   523 296    
Depreciation/amortization   (51,775) (50,069) (42,430)  
Administrative expenses   (11,824) (10,743) (8,494)  
Other expenses   (2,010) (2,129) (2,171)  
Impairment of real estate investments   (4,663) (7,700)    
Interest expense   (40,071) (39,619) (40,441)  
Interest and other income   2,961 2,148 732  
Income (loss) before gain (loss) on sale of real estate and other investments and income from discontinued operations   20,298 10,238 19,843  
Gain (Loss) on sale of real estate and other investments   6,093 (51) 0  
Income (loss) from continuing operations   26,391 10,187 19,843  
Income (loss) from discontinued operations   2,293 (27,127) 10,129  
NET INCOME (LOSS)   28,684 (16,940) 29,972  
Segment Assets [Abstract]          
Property owned   1,546,367 1,450,216    
Less accumulated depreciation   (313,308) (302,405)    
Total property owned   1,233,059 1,147,811    
Assets held for sale and assets of discontinued operations   463,103 457,307    
Cash and cash equivalents   48,970 47,267 94,133 $ 39,989
Other investments   329 329    
Receivables and other assets   7,255 89,034    
Development in progress   153,994 104,609    
Unimproved land   25,827 22,864    
TOTAL ASSETS   1,997,837 1,869,221    
Subsequent Event [Member]          
Segment Reporting Information [Line Items]          
Number of reportable segments | Segment 3        
Multi-Family Residential [Member] | Operating Segments [Member]          
Segment revenues and net operating income [Abstract]          
Real estate revenue   118,526 102,059 89,923  
Real estate expenses   51,172 46,138 38,223  
Gain on involuntary conversion     2,480 3,852  
Net operating income   67,354 58,401 55,552  
Segment Assets [Abstract]          
Property owned   946,520 753,731    
Less accumulated depreciation   (180,414) (158,100)    
Total property owned   766,106 595,631    
Healthcare [Member] | Operating Segments [Member]          
Segment revenues and net operating income [Abstract]          
Real estate revenue   65,828 64,887 61,625  
Real estate expenses   16,937 16,889 16,529  
Gain on involuntary conversion     0 0  
Net operating income   48,891 47,988 45,096  
Segment Assets [Abstract]          
Property owned   495,021 522,135    
Less accumulated depreciation   (112,515) (105,376)    
Total property owned   382,506 416,759    
Industrial [Member] | Operating Segments [Member]          
Segment revenues and net operating income [Abstract]          
Real estate revenue   6,491 6,894 6,700  
Real estate expenses   1,536 2,043 1,871  
Gain on involuntary conversion     0 0  
Net operating income   4,955 4,851 4,829  
Segment Assets [Abstract]          
Property owned   60,611 55,375    
Less accumulated depreciation   (11,256) (10,198)    
Total property owned   49,355 45,177    
Other Segments [Member] | Operating Segments [Member]          
Segment revenues and net operating income [Abstract]          
Real estate revenue   10,150 11,539 11,485  
Real estate expenses   4,188 4,725 5,547  
Gain on involuntary conversion     0 1,232  
Net operating income   5,962 6,814 $ 7,170  
Segment Assets [Abstract]          
Property owned   44,215 118,975    
Less accumulated depreciation   (9,123) (28,731)    
Total property owned   $ 35,092 $ 90,244