Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net sales	$ 280.2	$ 279.1	$ 538.3	$ 542.4
Sales Channel, Directly to Consumer [Member]
Net sales	179.7	172.9	343.5	341.9
Sales Channel, Through Intermediary [Member]
Net sales	100.5	106.2	194.8	200.5
Equipment Sales [Member]
Net sales	172.1	177.1	330.2	338.0
Parts and Consumables [Member]
Net sales	66.1	62.3	126.7	124.6
Specialty Service Coatings [Member]
Net sales	0.0	0.0	0.0	1.5
Service and Other [Member]
Net sales	42.0	39.7	81.4	78.3
Americas [Member]
Net sales	178.4	167.2	338.7	325.0
EMEA [Member]
Net sales	77.3	85.2	156.0	166.1
Asia Pacific [Member]
Net sales	$ 24.5	$ 26.7	$ 43.6	$ 51.3