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Note G - Treasury Stock (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Dec. 31, 2020
Apr. 30, 2017
Treasury Stock, Value, Acquired, Cost Method $ (0) $ 144,000 $ (0) $ 321,000      
Treasury Stock, Shares, Ending Balance (in shares) 5,970,780       5,970,780 5,967,824  
Treasury Stock, Value, Ending Balance $ 159,262,000       $ 159,262,000 $ 159,118,000  
September 2011 Reauthorization [Member]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)             500,000
Treasury Stock, Shares, Acquired (in shares)         2,956    
Treasury Stock, Value, Acquired, Cost Method         $ 144,000