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SEGMENT REPORTING (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Oct. 31, 2017
USD ($)
segment
Oct. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
segment
Apr. 30, 2017
USD ($)
Segment Reporting Information [Line Items]            
Number of reportable segments | segment     2   5  
Segment revenues and net operating income [Abstract]            
Real estate revenue $ 53,921 $ 50,609 $ 106,656 $ 100,220    
Real estate expenses 25,297 21,573 49,547 43,207    
Net operating income (loss) 28,624 29,036 57,109 57,013    
Depreciation/amortization (20,694) (13,531) (49,621) (27,798)    
Impairment of real estate investments     (256) (54,153)    
General and administrative expenses (3,118) (3,522) (7,120) (7,023)    
Interest expense (9,666) (10,626) (18,961) (20,990)    
Loss on extinguishment of debt (334)   (533)      
Interest and other income 256 93 487 281    
(Loss) income before gain (loss) on sale of real estate and other investments and income from discontinued operations (4,932) 1,450 (18,895) (52,670)    
Gain (loss) on sale of real estate and other investments 5,324 (103) 5,448 8,855    
Income (loss) from continuing operations 392 1,347 (13,447) (43,815)    
Income (loss) from discontinued operations 12,747 10,943 13,307 15,511    
NET INCOME (LOSS) 13,139 12,290 (140) (28,304)    
Segment Assets [Abstract]            
Property owned 1,831,181   1,831,181     $ 1,677,481
Less accumulated depreciation (384,402)   (384,402)     (340,417)
Total property owned 1,446,779   1,446,779     1,337,064
Assets held for sale and assets of discontinued operations           37,708
Cash and cash equivalents 42,464 68,729 42,464 68,729 $ 66,698 28,819
Mortgage loans receivable 10,329   10,329      
Receivables and other assets 36,239   36,239     52,468
Unimproved land 15,216   15,216     18,455
TOTAL ASSETS 1,551,027   1,551,027     1,474,514
Amounts Not Allocated to Segments [Member]            
Segment revenues and net operating income [Abstract]            
Real estate expenses 1,338 1,126 3,045 2,963    
Net operating income (loss) (1,338) (1,126) (3,045) (2,963)    
Multi-Family Residential [Member] | Operating Segments [Member]            
Segment revenues and net operating income [Abstract]            
Real estate revenue 39,734 36,187 78,164 71,229    
Real estate expenses 18,888 15,566 36,353 30,445    
Net operating income (loss) 20,846 20,621 41,811 40,784    
Segment Assets [Abstract]            
Property owned 1,409,598   1,409,598     1,251,716
Less accumulated depreciation (269,976)   (269,976)     (232,183)
Total property owned 1,139,622   1,139,622     1,019,533
Healthcare [Member] | Operating Segments [Member]            
Segment revenues and net operating income [Abstract]            
Real estate revenue 11,449 11,661 22,827 23,202    
Real estate expenses 4,373 4,151 8,658 8,343    
Net operating income (loss) 7,076 7,510 14,169 14,859    
Segment Assets [Abstract]            
Property owned 321,863   321,863     323,148
Less accumulated depreciation (91,948)   (91,948)     (86,139)
Total property owned 229,915   229,915     237,009
All Other [Member] | Operating Segments [Member]            
Segment revenues and net operating income [Abstract]            
Real estate revenue 2,738 2,761 5,665 5,789    
Real estate expenses 698 730 1,491 1,456    
Net operating income (loss) 2,040 $ 2,031 4,174 $ 4,333    
Segment Assets [Abstract]            
Property owned 99,720   99,720     102,617
Less accumulated depreciation (22,478)   (22,478)     (22,095)
Total property owned $ 77,242   $ 77,242     $ 80,522