SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jan. 31, 2017 USD ($) segment	Jan. 31, 2016 USD ($)	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	$ 51,174	$ 48,406	$ 151,394	$ 139,797
Real estate expenses	22,793	20,321	66,000	58,576
Net operating income (loss)	28,381	28,085	85,394	81,221
Depreciation/amortization	(13,475)	(12,693)	(41,273)	(36,315)
Impairment of real estate investments		(162)	(54,153)	(3,320)
General and administrative expenses	(3,130)	(2,929)	(8,438)	(8,316)
Acquisition and investment related costs	(5)	(35)	(52)	(433)
Other expenses	(1,037)	(51)	(2,705)	(1,281)
Interest expense	(10,680)	(9,151)	(31,670)	(25,706)
Loss on extinguishment of debt	(1,907)	0	(1,907)	(106)
Interest and other income	974	701	2,656	1,973
Income (loss) before (loss) gain on sale of real estate and other investments, and income from discontinued operations	(879)	3,765	(52,148)	7,717
Gain (loss) on sale of real estate and other investments	2,437	1,446	11,292	1,271
Income (loss) from continuing operations	1,558	5,211	(40,856)	8,988
Income (loss) from discontinued operations	23,631	38,232	37,741	55,859
NET INCOME (LOSS)	25,189	43,443	(3,115)	64,847
Segment Assets [Abstract]
Property owned	1,685,823		1,685,823		$ 1,681,471
Less accumulated depreciation	(334,875)		(334,875)		(312,889)
Total property owned	1,350,948		1,350,948		1,368,582
Assets held for sale and assets of discontinued operations	140,226		140,226		220,537
Cash and cash equivalents	56,999	47,117	56,999	47,117	66,698	$ 48,970
Other investments					50
Receivables and other assets	30,309		30,309		26,535
Development in progress	11,531		11,531		51,681
Unimproved land	19,076		19,076		20,939
TOTAL ASSETS	1,609,089		1,609,089		1,755,022
Amounts Not Allocated to Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate expenses	1,403	1,152	4,365	3,232
Net operating income (loss)	(1,403)	(1,152)	(4,365)	(3,232)
Multi-Family Residential [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	36,269	33,425	107,559	97,034
Real estate expenses	16,336	14,564	46,781	42,194
Net operating income (loss)	19,933	18,861	60,778	54,840
Segment Assets [Abstract]
Property owned	1,245,033		1,245,033		1,243,909
Less accumulated depreciation	(222,568)		(222,568)		(209,156)
Total property owned	1,022,465		1,022,465		1,034,753
Healthcare [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	12,099	11,859	35,301	33,989
Real estate expenses	4,216	3,971	12,560	11,287
Net operating income (loss)	7,883	7,888	22,741	22,702
Segment Assets [Abstract]
Property owned	343,814		343,814		337,920
Less accumulated depreciation	(91,287)		(91,287)		(83,558)
Total property owned	252,527		252,527		254,362
All Other [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	2,806	3,122	8,534	8,774
Real estate expenses	838	634	2,294	1,863
Net operating income (loss)	1,968	$ 2,488	6,240	$ 6,911
Segment Assets [Abstract]
Property owned	96,976		96,976		99,642
Less accumulated depreciation	(21,020)		(21,020)		(20,175)
Total property owned	$ 75,956		$ 75,956		$ 79,467