Note 10 - Warranty Costs (Tables)

6 Months Ended

Jun. 30, 2015

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

	Six Months Ended June 30,
	2015			2014
	(Dollars in thousands)
Warranty accrual, beginning of the period	$	13,584		$	13,811
Warranty costs accrued during the period		4,359			2,812
Warranty costs paid during the period		(4,397	)		(3,277	)
Warranty accrual, end of the period	$	13,546		$	13,346