Note 13 - Warranty Accrual (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended December 31,
	2019			2018			2017
	(Dollars in thousands)
Balance at beginning of period	$	28,262		$	21,909		$	20,678
Expense provisions		15,525			14,513			10,769
Cash payments		(12,466	)		(11,573	)		(10,879	)
Adjustments		65			3,413			1,341
Balance at end of period	$	31,386		$	28,262		$	21,909