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SEGMENT REPORTING (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Segment
Oct. 31, 2013
Apr. 30, 2014
Apr. 30, 2013
SEGMENT REPORTING [Abstract]            
Number of reportable segments     5      
Segment revenues and net operating income [Abstract]            
Real estate revenue $ 70,885 $ 65,772 $ 139,515 $ 130,870    
Gain on involuntary conversion 0 0 0 966    
TRS senior housing revenue 843 0 1,636 0    
TRS senior housing expenses (725) 0 (1,418) 0    
Interest expense (14,599) (14,799) (29,263) (29,395)    
Income (loss) before gain (loss) on sale of real estate and other investments and income (loss) from discontinued operations 4,639 4,922 7,433 7,528    
Gain (loss) on sale of real estate and other investments 1,231 0 (1,762) 0    
Income from continuing operations 5,870 4,922 5,671 7,528    
Income from discontinued operations 0 5,375 0 5,985    
NET INCOME 5,870 10,297 5,671 13,513    
Segment Assets [Abstract]            
Property owned 2,013,770   2,013,770   1,996,031  
Less accumulated depreciation (426,545)   (426,545)   (424,288)  
Total property owned 1,587,225   1,587,225   1,571,743  
Real Estate Held-for-sale 41,183   41,183   2,951  
Cash and cash equivalents 52,999 68,727 52,999 68,727 47,267 94,133
Other investments 329   329   329  
Receivables and other assets 108,397   108,397   119,458  
Development in progress 146,390   146,390   104,609  
Unimproved land 24,947   24,947   22,864  
TOTAL ASSETS 1,961,470   1,961,470   1,869,221  
Operating Segments [Member]
            
Segment revenues and net operating income [Abstract]            
Real estate revenue 70,042 65,772 137,879 130,870    
Real estate expenses 27,237 26,331 54,755 52,971    
Gain on involuntary conversion       966    
Net operating income 42,805 39,441 83,124 78,865    
TRS senior housing revenue 843   1,636      
TRS senior housing expenses (725)   (1,418)      
Depreciation/amortization (17,668) (17,167) (34,724) (36,167)    
General and administrative (3,468) (3,205) (7,744) (6,637)    
Impairment of real estate investments (3,245)   (5,565)      
Interest expense (14,599) (14,799) (29,263) (29,395)    
Interest and other income 696 652 1,387 862    
Income (loss) before gain (loss) on sale of real estate and other investments and income (loss) from discontinued operations 4,639   7,433      
Gain (loss) on sale of real estate and other investments 1,231   (1,762)      
Income from continuing operations   4,922   7,528    
Income from discontinued operations   5,375   5,985    
NET INCOME 5,870 10,297 5,671 13,513    
Multi-Family Residential [Member]
            
Segment Assets [Abstract]            
Property owned 847,155   847,155   753,731  
Less accumulated depreciation (166,181)   (166,181)   (158,100)  
Total property owned 680,974   680,974   595,631  
Multi-Family Residential [Member] | Operating Segments [Member]
            
Segment revenues and net operating income [Abstract]            
Real estate revenue 29,594 25,438 57,321 49,811    
Real estate expenses 12,164 11,162 24,382 22,007    
Gain on involuntary conversion       966    
Net operating income 17,430 14,276 32,939 28,770    
Commercial-Office [Member]
            
Segment Assets [Abstract]            
Property owned 480,185   480,185   544,628  
Less accumulated depreciation (109,813)   (109,813)   (121,892)  
Total property owned 370,372   370,372   422,736  
Commercial-Office [Member] | Operating Segments [Member]
            
Segment revenues and net operating income [Abstract]            
Real estate revenue 18,984 19,367 37,831 38,681    
Real estate expenses 9,496 9,525 18,824 19,279    
Gain on involuntary conversion       0    
Net operating income 9,488 9,842 19,007 19,402    
Commercial-Healthcare [Member]
            
Segment Assets [Abstract]            
Property owned 525,027   525,027   525,028  
Less accumulated depreciation (112,289)   (112,289)   (105,843)  
Total property owned 412,738   412,738   419,185  
Commercial-Healthcare [Member] | Operating Segments [Member]
            
Segment revenues and net operating income [Abstract]            
Real estate revenue 16,436 16,025 32,734 32,098    
Real estate expenses 4,173 4,128 8,590 8,412    
Gain on involuntary conversion       0    
Net operating income 12,263 11,897 24,144 23,686    
Commercial-Industrial [Member]
            
Segment Assets [Abstract]            
Property owned 50,719   50,719   55,375  
Less accumulated depreciation (10,483)   (10,483)   (10,198)  
Total property owned 40,236   40,236   45,177  
Commercial-Industrial [Member] | Operating Segments [Member]
            
Segment revenues and net operating income [Abstract]            
Real estate revenue 1,593 1,571 3,163 3,609    
Real estate expenses 272 501 721 956    
Gain on involuntary conversion       0    
Net operating income 1,321 1,070 2,442 2,653    
Commercial-Retail [Member]
            
Segment Assets [Abstract]            
Property owned 110,684   110,684   117,269  
Less accumulated depreciation (27,779)   (27,779)   (28,255)  
Total property owned 82,905   82,905   89,014  
Commercial-Retail [Member] | Operating Segments [Member]
            
Segment revenues and net operating income [Abstract]            
Real estate revenue 3,435 3,371 6,830 6,671    
Real estate expenses 1,132 1,015 2,238 2,317    
Gain on involuntary conversion       0    
Net operating income $ 2,303 $ 2,356 $ 4,592 $ 4,354