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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
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent   41.10% 38.50% 38.80%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 2,809
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00%    
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount   $ (2,774)
Deferred Tax Assets, Valuation Allowance   0 $ 0  
Domestic Tax Authority [Member]        
Operating Loss Carryforwards   37,200    
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards   $ 60,400    
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%