Note 11 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance at beginning of period	$ 59,218	$ 49,316	$ 41,785
Product warranty reserve assumed in acquisition	3,932	124	1,062
Payments	(42,682)	(33,496)	(26,096)
Provision for warranty issued	69,280	42,093	32,060
Changes in estimates for pre-existing warranties	4,465	1,181	505
Balance at end of period	94,213	59,218	49,316
Balance at beginning of period	89,788	78,738	68,340
Extended warranty contracts issued	41,560	26,968	24,483
Amortization of extended warranty contracts	(19,701)	(15,918)	(14,085)
Balance at end of period	$ 111,647	$ 89,788	$ 78,738