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DISCONTINUED OPERATIONS (Details) (USD $)
 3 Months Ended 9 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
DISCONTINUED OPERATIONS [Abstract]        
Number of multi-family residential properties sold     2  
REVENUE        
Real estate rentals $ 54,307,000 $ 49,859,000 $ 159,026,000 $ 147,663,000
Tenant reimbursement 11,924,000 10,687,000 34,134,000 32,247,000
TOTAL REVENUE 66,231,000 60,546,000 193,160,000 179,910,000
EXPENSES        
Depreciation/amortization related to real estate investments 15,506,000 14,280,000 46,602,000 42,470,000
Utilities 4,759,000 4,457,000 13,816,000 13,249,000
Maintenance 7,692,000 6,338,000 21,545,000 19,991,000
Real estate taxes 8,730,000 7,993,000 25,358,000 23,374,000
Insurance 1,070,000 876,000 2,932,000 2,514,000
Property management expenses 4,124,000 4,926,000 12,369,000 15,631,000
Impairment of Real Estate     0 135,000
Other expenses 464,000 359,000 1,496,000 1,509,000
Amortization related to non-real estate investments 794,000 903,000 2,426,000 2,395,000
TOTAL EXPENSES 45,384,000 41,791,000 132,946,000 127,077,000
Interest expense (15,725,000) (16,411,000) (48,448,000) (48,389,000)
Interest income 70,000 25,000 176,000 115,000
Gain on sale of discontinued operations     3,452,000 589,000
INCOME FROM DISCONTINUED OPERATIONS 776,000 (102,000) 3,530,000 496,000
Discontinued Operations [Member]
        
REVENUE        
Real estate rentals 27,000 459,000 778,000 1,375,000
Tenant reimbursement 0 18,000 0 54,000
TOTAL REVENUE 27,000 477,000 778,000 1,429,000
EXPENSES        
Depreciation/amortization related to real estate investments 0 79,000 114,000 248,000
Utilities 4,000 69,000 67,000 175,000
Maintenance 5,000 57,000 132,000 194,000
Real estate taxes 3,000 56,000 78,000 154,000
Insurance 1,000 14,000 24,000 38,000
Property management expenses 6,000 63,000 118,000 207,000
Impairment of Real Estate 0 135,000 0 135,000
TOTAL EXPENSES 19,000 473,000 533,000 1,151,000
Operating Income 8,000 4,000 245,000 278,000
Interest expense (6,000) (122,000) (169,000) (387,000)
Disposal Group Including Discontinued Operation Other Income 2,000 16,000 2,000 16,000
Income from discontinued operations before gain on sale 4,000 (102,000) 78,000 (93,000)
Gain on sale of discontinued operations 772,000 0 3,452,000 589,000
INCOME FROM DISCONTINUED OPERATIONS $ 776,000 $ (102,000) $ 3,530,000 $ 496,000