Note 2 - Summary of Significant Accounting Policies (Detail) - Warranty Costs Accrual (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Warranty accrual balance	$ 17,572	$ 20,866	$ 22,606
Warranty costs accrued during the year	1,497	2,794	4,183
Warranty costs paid during the year	(3,555)	(3,188)	(3,896)
Adjustments to warranty accrual during the year		(2,900)	(2,027)
Warranty accrual balance	$ 15,514	$ 17,572	$ 20,866