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Note 9 - Intangible Assets, Net (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | June 30, 2025 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 10,113 |  |  | $ | (6,632 | ) |  | $ | 3,481 |
Trademarks |  |  | 228 |  |  |  | (70 | ) |  |  | 158 |
Total intangible assets |  | $ | 10,341 |  |  | $ | (6,702 | ) |  | $ | 3,639 |
|  | December 31, 2024 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 9,873 |  |  | $ | (6,355 | ) |  | $ | 3,518 |
Trademarks |  |  | 218 |  |  |  | (56 | ) |  |  | 162 |
Total intangible assets |  | $ | 10,091 |  |  | $ | (6,411 | ) |  | $ | 3,680 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
2025 (remaining 6 months) |  | $ | 220 |
2026 |  |  | 435 |
2027 |  |  | 435 |
2028 |  |  | 435 |
2029 |  |  | 435 |
2030 and thereafter |  |  | 1,679 |
|  | $ | 3,639 |

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