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Note J - Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
 
 
 
  
2019
    
2018
  
   
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Write-offs
 
    
Net
Carrying
Amount
    
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Net
Carrying
Amount
  
                                                         
Patents and patents pending
   $
380,080
     $
(210,694
)
   $
(15,000
 )   $
154,386
     $
378,344
     $
(182,438
)
   $
195,906