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Note E - Preferred Stock and Warrants (Details Textual) - $ / shares
Sep. 03, 2019
Oct. 05, 2018
Sep. 30, 2020
Dec. 31, 2019
Preferred Stock, Shares Authorized (in shares)     10,000,000 10,000,000
Convertible Preferred Stock, Conversion Restriction, Percentage of Common Stock 4.985%      
Series A Preferred Stock [Member]        
Preferred Stock, Shares Authorized (in shares)     9,578 9,578
Preferred Stock, Shares Issued, Total (in shares)     9,577 9,577
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     0 0
Preferred Stock, Aggregate Stated Value Per Share (in dollars per share)   $ 1,000    
Convertible Preferred Stock, Conversion Price (in dollars per share)   $ 3    
Conversion Of Stock Shares Issuable If Converted (in shares)   3,192,333    
Series B-1 Convertible Preferred Stock [Member]        
Preferred Stock, Shares Authorized (in shares)     1,576 1,576
Preferred Stock, Shares Issued, Total (in shares)     1,576 1,576
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     0 0
Debt Conversion, Converted Instrument, Shares Issued (in shares) 1,576      
Preferred Stock, Aggregate Stated Value Per Share (in dollars per share) $ 1,000      
Convertible Preferred Stock, Conversion Price (in dollars per share) $ 0.9494      
Conversion Of Stock Shares Issuable If Converted (in shares) 1,659,996      
Convertible Preferred Stock, Conversion Restriction, Percentage of Common Stock 4.985%      
Preferred Stock, Liquidation Preference Per Share (in dollars per share) $ 0.0001      
Series B-2 Convertible Preferred Stock [Member]        
Preferred Stock, Shares Authorized (in shares)     27,000 27,000
Preferred Stock, Shares Issued, Total (in shares)     0 0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     0 0
Preferred Stock, Aggregate Stated Value Per Share (in dollars per share) 1,000      
Convertible Preferred Stock, Conversion Price (in dollars per share) $ 0.9494      
Conversion Of Stock Shares Issuable If Converted (in shares) 28,439,015      
Preferred Class A [Member]        
Debt Conversion, Converted Instrument, Shares Issued (in shares)   9,577    
Preferred Stock, Aggregate Stated Value Per Share (in dollars per share)   $ 1,000