Note 7 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	24.70%	24.40%
Unrecognized Tax Benefits	$ 92.2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	77.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 8.9