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Note 8 - Fair Value Measurements (Details Textual) $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Amortized Cost	$ 15.6
Debt Security Interest Rate Stated Percentage	7.50%
Debt Security, Available-For-Sale, Fair Value Discount Amount	$ 1.7	$ 1.8
Prepaid Expenses and Other Current Assets [Member]
Debt Securities, Available-for-Sale, Current	0.8	0.8
Other Noncurrent Assets [Member]
Debt Securities, Available-for-Sale, Noncurrent	$ 11.7	$ 11.8
Measurement Input, Discount Rate [Member]
Debt Securities, Available-for-Sale, Measurement Input	0.126	0.13

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-Topic 944
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