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Note H - Intangible Assets | 12 Months Ended
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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.

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