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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Apr. 30, 2018
EQUITY      
Preferred units, shares outstanding (in shares) 3,881,453 4,100,000  
Common stock issued (in shares) 13,027,172 12,098,379  
Common shares outstanding (in shares) 13,027,172 12,098,379  
Noncontrolling Interests Operating Partnership Units 976,516 1,058,142  
Series C Preferred Stock      
EQUITY      
Preferred shares liquidation preference $ 97,000,000.0 $ 103,000,000.0  
Series D Preferred Units      
EQUITY      
Preferred units, par value (in dollars per share) $ 100 $ 100  
Preferred shares issued (in shares) 165,600 165,600  
Preferred units, shares outstanding (in shares) 165,600 165,600  
Preferred units, liquidation preference $ 16,560,000 $ 16,560,000  
Series C Preferred Shares Of Beneficial Interest      
EQUITY      
Preferred shares issued (in shares) 3,881,453 4,118,460  
Preferred units, shares outstanding (in shares)   4,118,460 4,100,000
Preferred shares liquidation preference $ 97,036,325 $ 102,971,475  
Term loans      
LIABILITIES      
Unamortized loan costs 754,000 942,000  
Mortgages payable      
LIABILITIES      
Unamortized loan costs $ 1,371,000 $ 1,712,000