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5. Income Taxes (Details - Gross Unrecognized Tax Benefits) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Gross unrecognized tax benefits beginning balance $ 129 $ 346 $ 541
Increase in tax positions for prior years 122 6 11
Increase in tax positions for current year 0 0 0
Lapse in statutes of limitation (131) (223) (206)
Gross unrecognized tax benefits ending balance $ 120 $ 129 $ 346