Note 12 - Warranty Costs Accrual (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Warranty accrual	$ 40,691	$ 13,584
Warranty costs accrued during the period	10,823	4,359
Warranty costs paid during the period	(9,941)	(4,397)
Warranty accrual	$ 41,573	$ 13,546