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Note E - Convertible Preferred Stock and Share Repurchase Program (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 30, 2018
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2023
May 02, 2023
Jun. 30, 2022
Preferred Stock, Shares Authorized (in shares)   1,000,000        
Stock Repurchase Program, Authorized Amount         $ 6,500,000  
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 1 $ 1 $ 1    
Treasury Stock, Shares, Acquired (in shares)     100,000 400,000    
Treasury Stock, Value, Acquired, Cost Method     $ 490,000 $ 2,370,000    
Preferred Stock [Member]            
Treasury Stock, Value, Acquired, Cost Method     (0) (0)    
Common Stock [Member]            
Treasury Stock, Value, Acquired, Cost Method     $ (0) $ (0)    
Wipro [Member]            
Common Stock, Par or Stated Value Per Share (in dollars per share)           $ 1
Wipro [Member] | Common Stock [Member]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)           100,000
Series A Preferred Stock [Member]            
Treasury Stock, Shares, Acquired (in shares)   9,926        
Series A Preferred Stock [Member] | Wipro [Member]            
Stock Issued During Period, Shares, New Issues (in shares) 9,926          
Shares Issued, Price Per Share (in dollars per share) $ 1,000          
Stock Issued During Period, Value, New Issues $ 9,900,000          
Payments of Stock Issuance Costs 200,000          
Proceeds from Issuance of Preferred Stock and Preference Stock $ 9,900,000          
Series A Preferred Stock [Member] | Wipro [Member] | Preferred Stock [Member]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)           9,926
Stock Repurchase Program, Authorized Amount           $ 9,926,000