SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Oct. 31, 2016 USD ($) segment	Oct. 31, 2015 USD ($)	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Segment revenues and net operating income [Abstract]
Real estate revenue	$ 50,609	$ 46,346	$ 100,220	$ 91,391
Real estate expenses	21,573	19,951	43,207	38,255
Net operating income (loss)	29,036	26,395	57,013	53,136
Depreciation/amortization	(13,531)	(12,405)	(27,798)	(23,622)
Impairment of real estate investments		(1,873)	(54,153)	(3,158)
General and administrative expenses	(2,702)	(2,933)	(5,308)	(5,387)
Acquisition and investment related costs	(4)	(391)	(47)	(398)
Other expenses	(816)	(813)	(1,668)	(1,230)
Interest expense	(10,626)	(8,741)	(20,990)	(16,555)
Loss on extinguishment of debt		(106)		(106)
Interest and other income	637	665	1,682	1,272
Income (loss) before (loss) gain on sale of real estate and other investments, and income from discontinued operations	1,994	(202)	(51,269)	3,952
Gain (loss) on sale of real estate and other investments	(103)		8,855	(175)
Income (loss) from continuing operations	1,891	(202)	(42,414)	3,777
Income (loss) from discontinued operations	10,399	16,879	14,110	17,627
NET INCOME (LOSS)	12,290	16,677	(28,304)	21,404
Segment Assets [Abstract]
Property owned	1,665,354		1,665,354		$ 1,681,471
Less accumulated depreciation	(321,790)		(321,790)		(312,889)
Total property owned	1,343,564		1,343,564		1,368,582
Assets held for sale and assets of discontinued operations	191,233		191,233		220,537
Cash and cash equivalents	68,729	55,133	68,729	55,133	66,698	$ 48,970
Other investments					50
Receivables and other assets	35,803		35,803		26,535
Development in progress	20,921		20,921		51,681
Unimproved land	19,069		19,069		20,939
TOTAL ASSETS	1,679,319		1,679,319		1,755,022
Amounts Not Allocated to Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate expenses	1,126	1,306	2,963	2,080
Net operating income (loss)	(1,126)	(1,306)	(2,963)	(2,080)
Multi-Family Residential [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	36,250	32,176	71,290	63,609
Real estate expenses	15,566	14,191	30,445	27,631
Net operating income (loss)	20,684	17,985	40,845	35,978
Segment Assets [Abstract]
Property owned	1,226,198		1,226,198		1,243,909
Less accumulated depreciation	(212,922)		(212,922)		(209,156)
Total property owned	1,013,276		1,013,276		1,034,753
Healthcare [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	11,661	11,351	23,202	22,130
Real estate expenses	4,151	3,834	8,343	7,316
Net operating income (loss)	7,510	7,517	14,859	14,814
Segment Assets [Abstract]
Property owned	342,242		342,242		337,920
Less accumulated depreciation	(88,669)		(88,669)		(83,558)
Total property owned	253,573		253,573		254,362
All Other [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	2,698	2,819	5,728	5,652
Real estate expenses	730	620	1,456	1,228
Net operating income (loss)	1,968	$ 2,199	4,272	$ 4,424
Segment Assets [Abstract]
Property owned	96,914		96,914		99,642
Less accumulated depreciation	(20,199)		(20,199)		(20,175)
Total property owned	$ 76,715		$ 76,715		$ 79,467