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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) | Jul. 31, 2015 | Apr. 30, 2015
--- | --- | ---
Other assets |  |
Intangible assets, accumulated amortization | $ 20,643,000 | $ 19,610,000
Property and equipment, accumulated depreciation | 1,482,000 | 1,464,000
Deferred charges and leasing costs, accumulated amortization | $ 8,301,000 | $ 8,077,000
EQUITY |  |
Common Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Common Shares of Beneficial Interest, shares issued (in shares) | 125,519,557 | 124,455,624
Common Shares of Beneficial Interest, shares outstanding (in shares) | 125,519,557 | 124,455,624
Noncontrolling interests - Operating Partnership (in shares) | 13,921,386 | 13,999,725
Receivable Arising from Straight-Lining of Rents [Member] |  |
Other assets |  |
Accounts receivable, allowance | $ 689,000 | $ 718,000
Accounts Receivable [Member] |  |
Other assets |  |
Accounts receivable, allowance | $ 135,000 | $ 438,000
Preferred Series A [Member] |  |
EQUITY |  |
Preferred Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) | 1,150,000 | 1,150,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 1,150,000 | 1,150,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference | $ 28,750,000 | $ 28,750,000
Preferred Series B [Member] |  |
EQUITY |  |
Preferred Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) | 4,600,000 | 4,600,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 4,600,000 | 4,600,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference | $ 115,000,000 | $ 115,000,000

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