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Note 9 - Intangible Assets, Net | 3 Months Ended
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Mar. 31, 2025
Notes to Financial Statements |
Intangible Assets Disclosure [Text Block] | Note 9. Intangible Assets, net ​ Intangible assets consisted of the following for the periods indicated (in thousands): ​
|  | March 31, 2025 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 9,920 |  |  | $ | (6,448 | ) |  | $ | 3,472 |
Trademarks |  |  | 225 |  |  |  | (63 | ) |  |  | 162 |
Total intangible assets |  | $ | 10,145 |  |  | $ | (6,511 | ) |  | $ | 3,634 |
|  | 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 |
​ For the three months ended March 31, 2025 and 2024, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was $0.2 million and $0.1 million, respectively. The remaining weighted average amortization period for intangible assets is approximately 9 years. On March 31, 2025, future amortization expenses for intangible assets for future periods are estimated to be (in thousands):
2025 (remaining 9 months) |  | $ | 323 |
2026 |  |  | 430 |
2027 |  |  | 430 |
2028 |  |  | 430 |
2029 |  |  | 430 |
2030 and thereafter |  |  | 1,591 |
|  | $ | 3,634 |

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