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Note 4 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Oct. 27, 2017
May 09, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Combination, Acquisition Related Costs     $ 101 $ 69 $ 326
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     544    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     $ 331    
Property at 10 W 65th St. Manhattan, NY [Member]          
Business Combination, Consideration Transferred, Total $ 79,764        
Business Combination, Acquisition Related Costs $ 764        
107 Columbia Heights in Brooklyn, NY [Member]          
Business Combination, Consideration Transferred, Total   $ 87,616      
Business Combination, Acquisition Related Costs   $ 116