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Note 10 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Tax Expense (Benefit), Total $ 3,700 $ 4,709   $ 10,106 $ 13,391  
Effective Income Tax Rate Reconciliation, Percent, Total 20.10%   21.90% 19.70% 21.60%  
Effective Income Tax Rate Continuing Operations Increase (Decrease) During the Period (1.80%)     1.90%    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       21.00%    
Unrecognized Tax Benefits, Ending Balance $ 4,900     $ 4,900   $ 4,600
Income Taxes Payable, CARES Act (2,600)     (2,600)    
Deferred Tax Liabilities, CARES Act $ 2,600     $ 2,600