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Note I - Intangible Assets
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]
NOTE
I
—INTANGIBLE ASSETS
 
Intangible assets consisted of the following as of
December 
31:
 
   
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
  
 
Aggregate amortization expense for
2018
and 
2017
was
$15,596
and
$13,726,
respectively. Amounts are recorded in Research, Development and engineering expense. The estimated aggregate amortization expense of intangible assets for the years following
December 
31,
2018
is approximately
$13,000
per year for
2019
through
2023,
and approximately
$131,000
thereafter.