SEGMENT REPORTING (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 31, 2017 segment	Jul. 31, 2018 USD ($)	Jul. 31, 2017 USD ($)	Apr. 30, 2016 segment	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2			5
Segment revenues and net operating income [Abstract]
Real estate revenue		$ 45,946	$ 40,978
Net operating income (loss)		26,417	23,451
Real Estate Insurance		(225)	(485)
Depreciation/amortization		(18,612)	(25,338)
Impairment of real estate investments			(256)
General and administrative expenses		(3,870)	(4,002)
Interest expense		(8,385)	(8,131)
Loss on extinguishment of debt		(552)	(199)
Interest and other income		516	228
Loss before gain on sale of real estate and other investments and income from discontinued operations		(6,078)	(16,088)
Gain on sale of real estate and other investments		9,224	124
Income (loss) from continuing operations		3,146	(15,964)
Income (loss) from discontinued operations		570	2,685
NET INCOME (LOSS)		3,716	(13,279)
Segment Assets [Abstract]
Property owned		1,636,233			$ 1,669,764
Less accumulated depreciation		(326,772)			(311,324)
Total property owned		1,309,461			1,358,440
Cash and cash equivalents		16,261			11,891	$ 0
Restricted cash		4,103	3,713		4,225
Other assets		27,885			30,297
Unimproved land		7,926			11,476
Mortgage loans receivable		10,530			10,329
TOTAL ASSETS		1,376,166			1,426,658
Multi-Family Residential [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue		43,089	35,999
Net operating income (loss)		24,603	20,265
Segment Assets [Abstract]
Property owned		1,576,345			1,606,421
Less accumulated depreciation		(309,862)			(294,477)
Total property owned		1,266,483			1,311,944
All Other [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue		2,857	4,979
Net operating income (loss)		1,814	3,186
Segment Assets [Abstract]
Property owned		59,888			63,343
Less accumulated depreciation		(16,910)			(16,847)
Total property owned		42,978			$ 46,496
Real Estate [Member]
Segment revenues and net operating income [Abstract]
Cost of goods and services sold		(19,529)	(17,527)
Real Estate [Member] | Multi-Family Residential [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Cost of goods and services sold		(18,486)	(15,734)
Real Estate [Member] | All Other [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Cost of goods and services sold		(1,043)	(1,793)
Management Service [Member]
Segment revenues and net operating income [Abstract]
Cost of goods and services sold		$ (1,367)	$ (1,356)