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Note 15 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expense (Benefit)   $ 22,657 $ 21,514 $ 21,347
Effective Income Tax Rate Reconciliation, Percent   30.40% 33.40% 31.50%
Effective Income Tax Rate Continuing Operations Increase (Decrease) During the Period   (3.00%)    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00% 35.00% 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ (4,200)    
Income Tax Expense (Benefit), Adjustments for Transition Tax   2,400    
Undistributed Earnings of Foreign Subsidiaries   26,500    
Operating Loss Carryforwards   $ 21,900    
Operating Loss Carryforwards, Expiration Period   10 years    
Operating Loss Carryforwards, Percentage of Taxable Income   50.00%    
Deferred Tax Assets, Valuation Allowance   $ 6,633 $ 4,559  
Unrecognized Tax Benefits   $ 4,233 $ 3,796 $ 2,769
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%