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Note 4 - Other Accrued Liabilities | 3 Months Ended
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Mar. 31, 2024
Notes to Financial Statements |
Other Liabilities Disclosure [Text Block] | Note 4. Other Accrued Liabilities Other accrued liabilities consist of the following as of March 31, 2024 and December 31, 2023:
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Professional services |  | $ | 769,000 |  |  | $ | 472,000 |
Operating costs |  |  | 489,000 |  |  |  | 450,000 |
Other |  |  | 326,000 |  |  |  | 304,000 |
Total other accrued liabilities |  | $ | 1,584,000 |  |  | $ | 1,226,000 |

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