5. Income Taxes (Details - Income tax expense items) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal income tax, current	$ 11,848	$ 12,626	$ 12,541
State income tax, current	1,528	1,585	1,065
Income tax, current	13,376	14,211	13,606
Federal income tax, deferred	(1,364)	31	(1,063)
State income tax, deferred	(67)	(29)	140
Income tax, deferred	(1,431)	2	(923)
Total income tax expense	$ 11,945	$ 14,213	$ 12,683