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Note 16 - Contingencies (Details Textual) - USD ($)
$ in Millions
Jul. 31, 2020
Jan. 15, 2020
Dec. 31, 2020
New York City Department of Finance [Member] | State and Local Jurisdiction [Member]      
Income Tax Examination, Penalties and Interest Adjustment Requested $ 3.0 $ 8.2  
Income Tax Examination, Interest Adjustment Requested 0.7 $ 2.0  
New York City Department of Finance [Member] | State and Local Jurisdiction [Member] | Minimum [Member]      
Income Tax Examination, Estimate of Possible Loss 0.7    
New York City Department of Finance [Member] | State and Local Jurisdiction [Member] | Maximum [Member]      
Income Tax Examination, Estimate of Possible Loss $ 3.0    
Compliance with New York Executive Law and New York General Business Law [Member]      
Loss Contingency Accrual, Ending Balance     $ 3.7