Note 12 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Unrecognized Tax Benefits	$ 19.9		$ 19.8
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	3.5
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0.1	$ 0.1
Deferred Tax Assets, Valuation Allowance	$ 2.1		$ 2.0