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Note 10 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 3,800  
Effective Income Tax Rate Reconciliation, Percent, Total 15.90% 37.80% 38.80%
Deferred Tax Assets, Net of Valuation Allowance, Total $ 30,200    
Deferred Tax Liabilities, Gross, Total 16,256 $ 14,084  
Deferred Tax Assets, Valuation Allowance, Total 0 0  
Income Tax Examination, Penalties and Interest Expense, Total $ 0 $ 0 $ 0