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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Total Revenue [Member] | Geographic Concentration Risk [Member] | Commercial Segment [Member] | New York City [Member]    
Concentration Risk, Percentage 27.00% 26.00%
Total Revenue [Member] | Geographic Concentration Risk [Member] | Residential Segment [Member] | New York City [Member]    
Concentration Risk, Percentage 73.00% 74.00%
Obligated to Provide Parking [Member]    
Other Commitment $ 160