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Note 6 - Share Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Three Months Ended September 30, |
|  | 2020 |  |  | 2019 |
Selling, general and administrative |  | $ | 51,157 |  |  | $ | 121,999 |
Research, development and engineering |  |  | 3,073 |  |  |  | 15,102 |
|  | $ | 54,230 |  |  | $ | 137,101 |
|  | Nine Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |
Selling, general and administrative |  | $ | 632,793 |  |  | $ | 690,612 |
Research, development and engineering |  |  | 76,995 |  |  |  | 103,577 |
|  | $ | 709,788 |  |  | $ | 794,189 |

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