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Note E - Preferred Stock and Warrants (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Jan. 12, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2022
Dec. 31, 2021
Preferred Stock, Shares Authorized (in shares)         10,000,000 10,000,000
Preferred Stock, Shares Issued, Total (in shares)         0 0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         0 0
Debt Conversion, Converted Instrument, Shares Issued (in shares)       1,777,437    
Conversion of Series B-2 Preferred Stock into Common Stock [Member]            
Conversion of Stock, Shares Issued (in shares)     4,842,699      
The Facility Notes [Member]            
Repayments of Long-term Debt, Total $ 30.3          
December 2020 Exchange Agreement [Member]            
Debt Conversion, Converted Instrument, Shares Issued (in shares) 31,476.98412          
Debt Conversion, Converted Instrument, Warrants or Options Issued (in shares) 3,632,019          
Debt Conversion, Original Debt, Amount $ 31.5          
Series A Preferred Stock [Member]            
Preferred Stock, Shares Authorized (in shares)   9,578        
Series B-1 Convertible Preferred Stock [Member]            
Preferred Stock, Shares Issued, Total (in shares)   1,576        
Series B-2 Convertible Preferred Stock [Member]            
Preferred Stock, Shares Authorized, Elimated (in shares)   31,480        
Preferred Stock, Convertible, Shares Issuable (in shares) 4,842,690          
Preferred Stock, Convertible, Conversion Price (in dollars per share) $ 6.4999