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Note 9 - Intangible Assets, Net | 3 Months Ended
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Mar. 31, 2022
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, 2022 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 8,683 |  |  | $ | (4,910 | ) |  | $ | 3,773 |
Trademarks |  |  | 37 |  |  |  | (18 | ) |  |  | 19 |
Total intangible assets |  | $ | 8,720 |  |  | $ | (4,928 | ) |  | $ | 3,792 |
​
|  | December 31, 2021 |
​ |  | Gross |  |  | Accumulated |  |  | Intangible |
​ |  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 8,597 |  |  | $ | (4,779 | ) |  | $ | 3,818 |
Trademarks |  |  | 35 |  |  |  | (17 | ) |  |  | 18 |
Total intangible assets |  | $ | 8,632 |  |  | $ | (4,796 | ) |  | $ | 3,836 |
​ For the three months ended March 31, 2022 and 2021, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was each $0.1 million. The remaining weighted average amortization period for intangible assets is approximately 6 years. At March 31, 2022, future amortization expense for intangible assets is estimated to be (in thousands):
2023 |  | $ | 584 |
2024 |  |  | 584 |
2025 |  |  | 584 |
2026 |  |  | 584 |
2027 |  |  | 584 |
thereafter |  |  | 872 |
|  | $ | 3,792 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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