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Note I - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 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 |

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