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Note 16 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense (Benefit), Total $ 15,067 $ 22,657 $ 21,514
Effective Income Tax Rate Reconciliation, Percent, Total 16.40% 30.40% 33.40%
Effective Income Tax Rate Continuing Operations Increase (Decrease) During the Period (14.00%)    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 35.00%
Income Tax Expense (Benefit), Adjustments for Transition Tax   $ 2,400  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 500 (4,200)  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount (700)    
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit) 3,000    
Undistributed Earnings of Foreign Subsidiaries 6,800    
Operating Loss Carryforwards, Total $ 22,500    
Operating Loss Carryforwards, Expiration Period 10 years    
Operating Loss Carryforwards, Percentage of Taxable Income 50.00%    
Deferred Tax Assets, Valuation Allowance, Total $ 6,900 6,633  
Unrecognized Tax Benefits, Ending Balance $ 4,096 $ 4,233 $ 3,796