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11. INCOME TAXES (Details - Unrecognized tax benefit) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Unrecognized tax benefit, beginning balance $ 4,184 $ 3,756 $ 2,923
Additional based on current year tax positions   428 833
Reduction based on prior year tax postions (214)    
Unrecognized tax benefit, ending balance $ 3,970 $ 4,184 $ 3,756