Note 10 - Warranty Costs (Details) - Changes In Warranty Accrual (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Changes In Warranty Accrual [Abstract]
Warranty accrual, beginning of the period	$ 15,514	$ 17,572
Warranty costs accrued during the period	1,182	656
Warranty costs paid during the period	(1,772)	(1,635)
Warranty accrual, end of the period	$ 14,924	$ 16,593