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Note 5 - Share Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended June 30, |
|  | 201 9 |  |  | 201 8 |
Selling, general and administrative |  | $ | 115,526 |  |  | $ | 128,620 |
Research, development and engineering |  |  | 15,528 |  |  |  | 20,922 |
|  | $ | 131,054 |  |  | $ | 149,542 |
|  | Six Months Ended June 30, |
|  | 201 9 |  |  | 201 8 |
Selling, general and administrative |  | $ | 568,613 |  |  | $ | 599,766 |
Research, development and engineering |  |  | 88,475 |  |  |  | 99,709 |
|  | $ | 657,088 |  |  | $ | 699,475 |

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