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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
Jan. 31, 2017
Apr. 30, 2016
Other assets    
Intangible assets, accumulated amortization $ 5,372,000 $ 6,230,000
Property and equipment, accumulated depreciation 1,120,000 1,058,000
Deferred charges and leasing costs, accumulated amortization 3,819,000 3,719,000
LIABILITIES    
Mortgages payable, loan costs $ 5,525,000 $ 4,931,000
EQUITY    
Common Shares of Beneficial Interest, no par value (in dollars per share) $ 0 $ 0
Common Shares of Beneficial Interest, shares issued (in shares) 121,889,299 121,091,249
Common Shares of Beneficial Interest, shares outstanding (in shares) 121,889,299 121,091,249
Noncontrolling interests - Operating Partnership (in shares) 16,034,209 16,285,239
Receivable Arising from Straight-Lining of Rents [Member]    
Other assets    
Accounts receivable, allowance $ 308,000 $ 333,000
Accounts Receivable [Member]    
Other assets    
Accounts receivable, allowance $ 220,000 $ 97,000
Series A Preferred Stock [Member]    
EQUITY    
Preferred Shares of Beneficial Interest, par value (in dollars per share) $ 0 $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) 0 1,150,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) 0 1,150,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference   $ 28,750,000
Series B Preferred Stock [Member]    
EQUITY    
Preferred Shares of Beneficial Interest, 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