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9. Income Taxes (Details - Income tax expense) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Current federal tax expense $ (574) $ (7,526) $ 14,369
Current state tax expense 105 (2,064) 3,305
Deferred federal tax expense 2,759 9,074 10,131
Deferred state tax expense (benefit) 1,466 4,357 501
Income tax expense $ 3,756 $ 3,841 $ 28,306