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Note J - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  |  |  |  | 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 |

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