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Note I - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2021 |
|  | Gross |  |  | Accumulated |  |  | Intangible |
|  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 8,597 |  |  | $ | (4,779 | ) |  | $ | 3,818 |
Trademarks |  |  | 35 |  |  |  | (17 | ) |  | $ | 18 |
Total intangible assets |  | $ | 8,632 |  |  | $ | (4,796 | ) |  | $ | 3,836 |
|  | December 31, 2020 |
|  | Gross |  |  | Accumulated |  |  | Intangible |
|  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 8,158 |  |  | $ | (4,165 | ) |  | $ | 3,993 |
Trademarks |  |  | 21 |  |  |  | (15 | ) |  |  | 6 |
Total intangible assets |  | $ | 8,179 |  |  | $ | (4,180 | ) |  | $ | 3,999 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
2022 |  | $ | 584 |
2023 |  |  | 584 |
2024 |  |  | 584 |
2025 |  |  | 584 |
2026 |  |  | 584 |
thereafter |  |  | 916 |
|  | $ | 3,836 |

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