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Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Asset Impairment Charges | $ 0 | $ 0
Fair Value, Recurring [Member] |  |
Liabilities, Fair Value Disclosure | $ 0 | $ 0

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