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Note F - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00%    
Income Taxes Paid $ 7,800,000 $ 13,500,000 $ 19,400,000  
Deferred Tax Assets, Valuation Allowance 277,000 277,000 336,000  
Unrecognized Tax Benefits 492,000 567,000 576,000 $ 516,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 397,000 447,000    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit   56,000    
Tax Credit Carryforward, Amount 518,000 533,000    
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 222,000      
Income Tax Examination, Penalties and Interest Accrued 98,000 $ 116,000 $ 99,000  
Undistributed Earnings of Foreign Subsidiaries 23,900,000      
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries $ 1,900,000