Note 9 - Income Tax Expense (Benefit) (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	$ 0.2	$ 0.1
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0.2
Other Noncurrent Liabilities [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 0.8	$ 0.8	$ 0.8