Note 6 - Accrued Expenses and Other Long-Term Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accrued compensation and related benefits	$ 14.3	$ 5.6
Various other liabilities	$ 11.5	$ 2.8
Annual occupational disease benefits discount rate	5.60%	3.26%
Uninsured claims	$ 3.6	$ 3.9
Amount of occupational disease obligation	1.5	1.4
Contributions to defined contribution plan	2.3	1.2	$ 0.9
Other long-term liabilities
Uninsured claims	$ 2.7	$ 2.4