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Note I - Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
201
8
    
201
7
  
   
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Net
Carrying
Amount
    
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Net
Carrying
Amount
  
                                                 
Patents and patents pending
   $
378,344
     $
(182,438
)
   $
195,906
     $
347,946
     $
(166,842
)
   $
181,104
  
                                                 
Total
   $
378,344
     $
(182,438
)
   $
195,906
     $
347,946
     $
(166,842
)
   $
181,104