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Note 9 - Intangible Assets, Net | 3 Months Ended
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Mar. 31, 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): ​
|  | March 31, 2024 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 9,553 |  |  | $ | (6,081 | ) |  | $ | 3,472 |
Trademarks |  |  | 174 |  |  |  | (36 | ) |  |  | 138 |
Total intangible assets |  | $ | 9,727 |  |  | $ | (6,117 | ) |  | $ | 3,610 |
|  | 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 March 31, 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. The remaining weighted average amortization period for intangible assets is approximately 7 years. On March 31, 2024, future amortization expenses for intangible assets for future one year periods are estimated to be (in thousands):
2024(remaining 9 months) |  | $ | 388 |
2025 |  |  | 517 |
2026 |  |  | 517 |
2027 |  |  | 517 |
2028 |  |  | 517 |
2029 and thereafter |  |  | 1,154 |
|  | $ | 3,610 |

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