Note 11 - Warranty Accrual (Tables)

12 Months Ended

Dec. 31, 2014

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended December 31,
	2014			2013			2012
	(Dollars in thousands)
Balance at beginning of period	$	22,238		$	23,151		$	25,525
Expense provisions		4,834			5,562			4,216
Cash payments		(6,126	)		(6,475	)		(6,590	)
Adjustments		(2,600	)		-			-
Balance at end of period	$	18,346		$	22,238		$	23,151