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Note 4 - Fair-Value Measurements (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Investment Income, Interest | $ 14.7 | $ 2.2
Demand Deposits [Member] |  |
Restricted Cash, Current | $ 7.1 | $ 11.0

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