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Note I - Intangible Assets | 12 Months Ended
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Dec. 31, 2022
Notes to Financial Statements |
Intangible Assets Disclosure [Text Block] | NOTE I—INTANGIBLE ASSETS Intangible assets consisted of the following for the periods indicated (in thousands):
|  | 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 |
|  | 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 years ended December 31, 2022, 2021 and 2020, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was $0.6 million, $0.5 million and $0.5 million, respectively. The remaining weighted average amortization period for intangible assets is approximately six years. At December 31, 2022, future amortization expense for intangible assets is estimated to be (in thousands):
|  | December 31, 2022 |
2023 |  | $ | 627 |
2024 |  |  | 627 |
2025 |  |  | 627 |
2026 |  |  | 627 |
2027 |  |  | 627 |
2028 |  |  | 564 |
thereafter |  |  | - |
Total |  | $ | 3,699 |

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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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