10. INCOME TAXES (Details - Unrecognized tax benefit) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefit, beginning balance	$ 3,761	$ 3,970	$ 4,184
Increases resulting from prior period tax positions			0
Decreases resulting from prior period tax positions	(3,667)		(214)
Expiration of the statute of limitations for the assessment of taxes		(209)
Unrecognized tax benefit, ending balance	$ 94	$ 3,761	$ 3,970