Note 2 - Summary of Significant Accounting Policies - Warranty Costs Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Warranty accrual, beginning of the year	$ 40,691	$ 13,584	$ 13,811
Warranty accrual assumed with merger	0	25,528
Warranty costs accrued during the year	24,092	13,803	7,550
Warranty costs paid during the year	(20,851)	(12,224)	(7,777)
Warranty accrual, end of the year	$ 43,932	$ 40,691	$ 13,584