BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, GOODWILL AND INTANGIBLES (Details) (USD $)	6 Months Ended		12 Months Ended					3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Apr. 30, 2014	Apr. 30, 2014 Multi Family Residential [Member] Property	Apr. 30, 2014 Commercial Office [Member] Property	Apr. 30, 2014 Commercial Industrial [Member] Property	Apr. 30, 2014 Commercial Retail Property [Member] Property	Oct. 31, 2014 Acquired below-market leases and acquired above-market leases [Member]	Oct. 31, 2013 Acquired below-market leases and acquired above-market leases [Member]	Oct. 31, 2014 Acquired below-market leases and acquired above-market leases [Member]	Oct. 31, 2013 Acquired below-market leases and acquired above-market leases [Member]	Apr. 30, 2014 Acquired below-market leases and acquired above-market leases [Member]	Oct. 31, 2014 Other identified intangible assets [Member]	Oct. 31, 2013 Other identified intangible assets [Member]	Oct. 31, 2014 Other identified intangible assets [Member]	Oct. 31, 2013 Other identified intangible assets [Member]	Apr. 30, 2014 Other identified intangible assets [Member]
IDENTIFIED INTANGIBLE ASSETS AND INTANGIBLE LIABILITIES AND GOODWILL [Abstract]
New intangible assets	$ 365,000	$ 892,000
Addition to intangible liabilities	0	0
Weighted average lives of intangible assets and intangible liabilities	0 years 6 months	0 years 8 months 12 days
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross, Total	53,898,000		56,710,000
Finite-Lived Intangible Assets, Accumulated Amortization	(24,153,000)		(24,071,000)
Finite-Lived Intangible Assets, Net, Total	29,745,000		32,639,000
Indentified intangible liabilities, gross	148,000		173,000
Indentified intangible liabilities, accumulated amortization	(110,000)		(127,000)
Indentified intangible liabilities, net	38,000		46,000
Amortization of Intangible Assets								6,000	10,000	13,000	21,000		1,800,000	1,800,000	3,200,000	5,400,000
Estimated annual amortization [Abstract]
2016												19,000,000					4,505,000
2015												11,000,000					4,036,000
2018												(2,000,000)					3,605,000
2019												(3,000,000)					3,481,000
2020												(2,000,000)					3,395,000
Goodwill	1,940,000		1,100,000
Goodwill impairment	0		0
Goodwill derecognized	11,000	7,000	0
Goodwill added	$ 852,000
Real Estate Properties [Line Items]
Number of real estate properties sold				2	3	12	3