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Note E - Convertible Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Jan. 30, 2018
Jan. 30, 2018
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Preferred Stock, Shares Authorized (in shares)       1,000,000 1,000,000
Series A Preferred Stock [Member]          
Preferred Stock, Dividend Rate, Percentage     5.00% 5.00%  
Temporary Equity, Liquidation Preference       $ 1.9  
Temporary Equity, Liquidation Preference Per Share (in dollars per share)       $ 196.03  
Preferred Stock, Convertible, Conversion Ratio (Rate)       10091.00%  
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 $ 1,000      
Stock Issued During Period, Value, New Issues $ 9.9 $ 9.9      
Payments of Stock Issuance Costs 0.2        
Proceeds from Issuance of Preferred Stock and Preference Stock $ 9.9