Note 11 - Warranty Accrual (Details) - Warranty Accrual and Payment Activity - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Warranty Accrual and Payment Activity [Abstract]
Balance at beginning of period	$ 17,253	$ 20,178	$ 18,346	$ 22,238
Expense provisions	1,536	1,206	3,980	3,363
Cash payments	(2,708)	(1,758)	(6,032)	(3,900)
Adjustments		(525)	(213)	(2,600)
Balance at end of period	$ 16,081	$ 19,101	$ 16,081	$ 19,101