Note 10 - Warranty Costs (Tables)

3 Months Ended

Mar. 31, 2015

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Warranty accrual, beginning of the period	$	13,584		$	13,811
Warranty costs accrued during the period		1,775			1,183
Warranty costs paid during the period		(2,320	)		(1,361	)
Warranty accrual, end of the period	$	13,039		$	13,633