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Note 10 - Contingencies (Details Textual) - USD ($)
$ in Thousands
Jul. 31, 2020
Jan. 15, 2020
Sep. 30, 2020
New York City Department of Finance [Member] | State and Local Jurisdiction [Member]      
Income Tax Examination, Penalties and Interest Adjustment Requested $ 3,000 $ 8,200  
Income Tax Examination, Interest Adjustment Requested 700 $ 2,000  
New York City Department of Finance [Member] | State and Local Jurisdiction [Member] | Minimum [Member]      
Income Tax Examination, Estimate of Possible Loss 700    
New York City Department of Finance [Member] | State and Local Jurisdiction [Member] | Maximum [Member]      
Income Tax Examination, Estimate of Possible Loss $ 3,000    
Compliance with New York Executive Law and New York General Business Law [Member]      
Loss Contingency Accrual, Ending Balance     $ 1,450