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Note J - Intangible Assets
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]
NOTE
J
—INTANGIBLE ASSETS
 
Intangible assets consisted of the following as of
December 
31:
 
   
 
 
 
  
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
  
 
Aggregate amortization expense for
2019
and 
2018
was
$28,256
and
$15,596,
respectively. In
2019,
the Company recorded
$15,000
of write offs of patents rejected. Amounts are recorded in Research, Development and engineering expense. The estimated aggregate amortization expense of intangible assets for the years following
December 
31,
2019
is approximately
$
20,000
per year for
2020
through
2022,
$17,000
for
2023,
$13,000
for
2024
and approximately
$65,000
thereafter.