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Note 5 - Share Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Three Months Ended September 30, |
|  | 201 9 |  |  | 201 8 |
Selling, general and administrative |  | $ | 121,999 |  |  | $ | 170,758 |
Research, development and engineering |  |  | 15,102 |  |  |  | 25,588 |
|  | $ | 137,101 |  |  | $ | 196,346 |
|  | Nine Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 201 9 |  |  | 201 8 |
Selling, general and administrative |  | $ | 690,612 |  |  | $ | 770,524 |
Research, development and engineering |  |  | 103,577 |  |  |  | 125,297 |
|  | $ | 794,189 |  |  | $ | 895,821 |

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