Note 4 - Management Actions - Pre-tax Severance Related Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total pre-tax severance-related costs	$ 0.4	$ 0.9	$ 0.6	$ 0.9
Employee Severance [Member]
Total pre-tax severance-related costs	0.1	0.9	0.3	0.9
Other Restructuring [Member]
Total pre-tax severance-related costs	$ 0.3	$ 0.0	$ 0.3	$ 0.0