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Note F - Treasury Stock (Details Textual) - USD ($)
 9 Months Ended
Jul. 09, 2015
Sep. 30, 2015
Jun. 23, 2015
May. 22, 2015
Dec. 31, 2014
May. 31, 2014
The 2011 Authorization [Member]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           500,000
Treasury Stock, Shares, Acquired   31,263        
Treasury Stock, Value, Acquired, Cost Method   $ 1,495,000        
Maximum [Member]            
Treasury Stock, Shares, Tender Offer     150,000 80,000    
Treasury Stock Share Price, Tender Offer       $ 63    
Treasury Stock, Shares, Acquired 298,566          
Treasury Stock, Value, Acquired, Cost Method $ 17,783,000 $ 19,278,000        
Treasury Stock Acquired, Average Cost Per Share $ 59          
Treasury Stock, Oversubscribed Shares Tendered 148,566          
Treasury Stock, Shares   4,380,810     4,050,981  
Treasury Stock, Value   $ 101,779,000     $ 82,501,000