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Note 9 - Intangible Assets, Net | 9 Months Ended
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Sep. 30, 2023
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, 2023 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 9,363 |  |  | $ | (5,805 | ) |  | $ | 3,558 |
Trademarks |  |  | 95 |  |  |  | (27 | ) |  |  | 68 |
Total intangible assets |  | $ | 9,458 |  |  | $ | (5,832 | ) |  | $ | 3,626 |
|  | December 31, 2022 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 8,994 |  |  | $ | (5,330 | ) |  | $ | 3,664 |
Trademarks |  |  | 56 |  |  |  | (21 | ) |  |  | 35 |
Total intangible assets |  | $ | 9,050 |  |  | $ | (5,351 | ) |  | $ | 3,699 |
​ For the three months ended September 30, 2023 and 2022, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was each $0.2 million. For the nine months ended September 30, 2023 and 2022, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was each $0.5 million. The remaining weighted average amortization period for intangible assets is approximately 5.4 years. At September 30, 2023, future amortization expense for intangible assets for future one year periods is estimated to be (in thousands):
2024 |  | $ | 668 |
2025 |  |  | 668 |
2026 |  |  | 668 |
2027 |  |  | 668 |
2028 |  |  | 668 |
2029 and thereafter |  |  | 286 |
|  | $ | 3,626 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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