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Note H - Intangible Assets
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]
NOTE H—INTANGIBLE ASSETS
 
Intangible assets consisted of the following as of
December
 
31:
 
 
 
2016
 
 
2015
 
 
 
Gross
Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
Carrying
Amount
 
 
Gross
Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
Carrying
Amount
 
                                                 
Patents and patents pending
   $
287,248
     $
(153,116
)
   $
134,132
     $
287,248
     $
(139,510
)
   $
147,738
  
                                                 
Total
   $
287,248
     $
(153,116
)
   $
134,132
     $
287,248
     $
(139,510
)
   $
147,738
  
 
Aggregate amortization expense for both 
2016
and
2015
was
$13,606
.
Amounts are recorded in Research, Development and engineering expense. The estimated aggregate amortization expense of intangible assets for the years following
December
 
31,
2016
is approximately
$13,000
per year for
2017
through
2021,
and approximately
$35,000
thereafter.