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Note H - Intangible Assets
 12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]
NOTE H—INTANGIBLE ASSETS
 
Intangible assets consisted of the following as of December 31:
 
 
 
2015
 
 
2014
 
 
 
Gross
Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
Carrying
Amount
 
 
Gross
Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
Carrying
Amount
 
                                                 
Patents and patents pending
   $ 287,248     $ (139,510
)
   $ 147,738     $ 287,248     $ (125,904
)
   $ 161,344  
                                                 
Total
   $ 287,248     $ (139,510
)
   $ 147,738     $ 287,248     $ (125,904
)
   $ 161,344  
 
Aggregate amortization expense for both 2015 and 2014 was $13,606. The estimated aggregate amortization expense of intangible assets for the years following December 31, 2015 is approximately $14,000 per year for 2016 through 2020, and approximately $78,000 thereafter.