Note 15 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Expense	$ 18.6	$ 17.9	$ 15.0
Operating Lease, Weighted Average Remaining Lease Term (Year)	3 years 8 months 19 days	4 years 5 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.58%	3.88%
Royalty Requirements [Member]
Other Commitment, to be Paid, Year One	$ 2.0
Other Commitment, to be Paid, Year Two	1.5
Other Commitment, to be Paid, Year Three	1.4
Other Commitment, to be Paid, Year Four	0.7
Other Commitment, to be Paid, Year Five	0.7
Other Commitment, to be Paid, after Year Five	2.3
Accounts Payable and Accrued Liabilities [Member]
Operating Lease, Liability, Current	$ 18.8	$ 16.3
Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	20 years