Note 10 - Warranty Costs (Details) - Changes In Warranty Accrual (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Changes In Warranty Accrual [Abstract]
Warranty accrual, beginning of the period	$ 13,811	$ 15,514
Warranty costs accrued during the period	1,183	414
Warranty costs paid during the period	(1,361)	(796)
Warranty accrual, end of the period	$ 13,633	$ 15,132