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Note 6 - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Patents |  | $ | 565 |  |  | $ | 446 |  |  | $ | 119 |
Certifications |  |  | 54 |  |  |  | 54 |  |  |  | - |
Totals |  | $ | 619 |  |  | $ | 500 |  |  | $ | 119 |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Patents |  | $ | 602 |  |  | $ | 422 |  |  | $ | 180 |
Certifications |  |  | 54 |  |  |  | 51 |  |  |  | 3 |
Totals |  | $ | 656 |  |  | $ | 473 |  |  | $ | 183 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year Ended |  |  |  |
2023 |  | $ | 17 |
2024 |  |  | 13 |
2025 |  |  | 13 |
2026 |  |  | 5 |
2027 |  |  | 5 |
Thereafter |  |  | 66 |
Total |  | $ | 119 |

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