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Note 9 - Intangible Assets, Net | 9 Months Ended
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Sep. 30, 2024
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): ​
|  | September 30, 2024 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 9,788 |  |  | $ | (6,278 | ) |  | $ | 3,510 |
Trademarks |  |  | 202 |  |  |  | (49 | ) |  |  | 153 |
Total intangible assets |  | $ | 9,990 |  |  | $ | (6,327 | ) |  | $ | 3,663 |
|  | December 31, 2023 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 9,502 |  |  | $ | (5,981 | ) |  | $ | 3,521 |
Trademarks |  |  | 138 |  |  |  | (31 | ) |  |  | 107 |
Total intangible assets |  | $ | 9,640 |  |  | $ | (6,012 | ) |  | $ | 3,628 |
​ For the three months ended September 30, 2024 and 2023, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was $0.1 million and $0.2 million, respectively. For the nine months ended September 30, 2024 and 2023, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was $0.3 million and $0.5 million, respectively. The remaining weighted average amortization period for intangible assets is approximately 9 years. On September 30, 2024, future amortization expenses for intangible assets for future periods are estimated to be (in thousands):
2024 (remaining 3 months) |  | $ | 102 |
2025 |  |  | 442 |
2026 |  |  | 442 |
2027 |  |  | 442 |
2028 |  |  | 442 |
2029 and thereafter |  |  | 1,793 |
|  | $ | 3,663 |

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