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Note 5 - Share Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 20 20 |  |  | 201 9 |
Selling, general and administrative |  | $ | 441,308 |  |  | $ | 453,086 |
Research, development and engineering |  |  | 71,411 |  |  |  | 72,947 |
|  | $ | 512,719 |  |  | $ | 526,033 |

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