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9. Income Taxes (Details - Tax rate effect) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Expense at federal tax rate $ 3,928 $ 11,225 $ 17,381
State taxes, net of federal income tax effect 1,718 1,831 2,679
Stock-based compensation 238 682 824
Non-deductible expenses 824 171 145
Effect of change in tax rate 0 15,117 0
Accounting method change (2,100) 0 0
Other (767) (720) (668)
Income tax expense $ 3,841 $ 28,306 $ 20,361