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Note 6 - Income Taxes (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00%      
Income Taxes Paid     $ 13,500,000 $ 7,800,000 $ 13,500,000  
Tax Credit Carryforward, Amount $ 644,000   644,000 518,000    
Deferred Tax Assets, Valuation Allowance 459,000   459,000 277,000 277,000  
Unrecognized Tax Benefits 797,000   797,000 492,000 567,000 $ 576,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 674,000   674,000 397,000    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 56,000   56,000      
Income Tax Examination, Penalties and Interest Accrued 168,000   168,000 98,000 116,000  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 400,000   (1,600,000)      
Accrued Income Taxes, Noncurrent $ 1,400,000   1,400,000      
Effective Income Tax Rate Reconciliation, Foreign Withholding Tax, Amount     $ 600,000  
Scenario, Forecast [Member]            
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%