Note 2 - Summary of Significant Accounting Policies (Details) - Warranty Costs Accrual - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Warranty Costs Accrual [Abstract]
Warranty accrual, beginning of the year	$ 13,584	$ 13,811	$ 15,514
Warranty assumed with merger	25,528	0	0
Warranty costs accrued during the year	13,803	7,550	2,495
Warranty costs paid during the year	(12,224)	(7,777)	(4,198)
Warranty accrual, end of the year	$ 40,691	$ 13,584	$ 13,811