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Note E - Convertible Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Jan. 30, 2018
Mar. 31, 2022
Dec. 31, 2021
Preferred Stock, Shares Authorized (in shares)   1,000,000 1,000,000
Series A Preferred Stock [Member]      
Preferred Stock, Dividend Rate, Percentage   5.00%  
Temporary Equity, Liquidation Preference   $ 2.1  
Temporary Equity, Liquidation Preference Per Share (in dollars per share)   $ 208.36  
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)   100.91  
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 $ 9.9    
Payments of Stock Issuance Costs 0.2    
Proceeds from Issuance of Preferred Stock and Preference Stock $ 9.9