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Note G - Treasury Stock (Details Textual) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Nov. 30, 2017
Treasury Stock, Value, Acquired, Cost Method $ 3,000,000 $ 144,000  
September 2011 Reauthorization [Member]      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)     500,000
Treasury Stock, Shares, Acquired (in shares) 83,220    
Treasury Stock Shares Acquired Prior to Stock-Split (in shares) 41,610    
Treasury Stock, Value, Acquired, Cost Method $ 3,000,000    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) 458,390    
Treasury Stock, Shares, Retired (in shares) 12,268,395    
Treasury Stock, Common, Shares (in shares) 0