Note 3 - Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Sales Incentives [Member]
Beginning balance	$ 19.9	$ 12.1
Additions to sales incentive accrual	10.3	15.7
Contract payments	(16.4)	(13.0)
Foreign currency fluctuations	(0.5)	(0.2)
Ending balance	13.3	14.6
Maintenance [Member]
Foreign currency fluctuations	(0.3)	0.1
Beginning balance	11.2	9.3
Increase in deferred revenue representing our obligation to satisfy future performance obligations	15.6	17.8
Decrease in deferred revenue for amounts recognized in net sales for satisfied performance obligations	(14.8)	(17.1)
Ending balance	$ 11.7	$ 10.1