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Note I - Intangible Assets | 12 Months Ended
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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.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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