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Note 6 - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  | Weighted Average Amortization Period |  |  | Cost |  |  | Accumulated Amortization |  |  | Carrying Amount |
Patents, Copyrights and Intellectual Property |  |  | 14 |  |  | $ | 796,080 |  |  | $ | 300,528 |  |  | $ | 495,552 |
Licensing Agreement |  |  | 5 |  |  |  | 10,000 |  |  |  | 10,000 |  |  |  | 0 |
Certifications |  |  | 4 |  |  |  | 58,486 |  |  |  | 58,486 |  |  |  | 0 |
Totals |  |  |  |  |  | $ | 864,566 |  |  | $ | 369,014 |  |  | $ | 495,552 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  | Weighted Average Amortization Period |  |  | Cost |  |  | Accumulated Amortization |  |  | Carrying Amount |
Patents, Copyrights and Intellectual Property |  |  | 18 |  |  | $ | 839,831 |  |  | $ | 177,669 |  |  | $ | 662,162 |
Licensing Agreement |  |  | 5 |  |  |  | 10,000 |  |  |  | 10,000 |  |  |  | 0 |
Certifications |  |  | 3 |  |  |  | 58,722 |  |  |  | 58,722 |  |  |  | 0 |
Other |  |  | 5 |  |  |  | 21,492 |  |  |  | 21,492 |  |  |  | 0 |
Totals |  |  |  |  |  | $ | 930,045 |  |  | $ | 267,883 |  |  | $ | 662,162 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year Ended |  |  |  |
2019 |  | $ | 121,613 |
2020 |  |  | 121,613 |
2021 |  |  | 121,613 |
2022 |  |  | 36,613 |
2023 |  |  | 36,613 |
Thereafter |  |  | 57,487 |
Total |  | $ | 495,552 |

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