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Note I - Intangible Assets | 12 Months Ended
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Dec. 31, 2021
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, 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 |
|  | December 31, 2020 |
|  | Gross |  |  | Accumulated |  |  | Intangible |
|  | Amount |  |  | amortization |  |  | assets, net |
Patents |  | $ | 8,158 |  |  | $ | (4,165 | ) |  | $ | 3,993 |
Trademarks |  |  | 21 |  |  |  | (15 | ) |  |  | 6 |
Total intangible assets |  | $ | 8,179 |  |  | $ | (4,180 | ) |  | $ | 3,999 |
For the years ended December 31, 2021, 2020 and 2019, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was $0.5 million each year. The remaining weighted average amortization period for intangible assets is approximately six years. At December 31, 2021, future amortization expense for intangible assets is estimated to be (in thousands):
2022 |  | $ | 584 |
2023 |  |  | 584 |
2024 |  |  | 584 |
2025 |  |  | 584 |
2026 |  |  | 584 |
thereafter |  |  | 916 |
|  | $ | 3,836 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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