Note 1 - Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Selling, General and Administrative Expense, Total		$ 321,900	$ 314,000	$ 357,200
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance	$ 36,000	36,000	(19,100)	(36,300)
Restricted Cash and Cash Equivalents, Total	500	500	600
Financing Receivable, after Allowance for Credit Loss, Total	$ 3,100	3,100
Financing Arrangement, Term (Year)	8 years
Goodwill, Impairment Loss		$ 0	0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)	1,193,414	1,193,414
Advertising Expense		$ 4,600	5,000	$ 8,200
Minimum [Member]
Warranty Term (Year)		1 year
Maximum [Member]
Warranty Term (Year)		4 years
Building and Building Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)		30 years
Property, Plant and Equipment, Other Types [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		15 years
Reclassification from Selling and Administrative Expense to Costs of Sales [Member]
Selling, General and Administrative Expense, Total			$ (5,000)