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Note 6 - Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2023 |  |  | December 31, 2022 |
|  | Weighted Average Amortization Period (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Amortization Period (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Patents and Trademarks |  |  | 0.0 |  |  | $ | 474,000 |  |  | $ | (474,000 | ) |  | $ | 0 |  |  |  | 1.0 |  |  | $ | 474,000 |  |  | $ | (473,000 | ) |  | $ | 1,000 |

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