(9) Income Taxes (Details - Tax rate effect) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Expense at federal tax rate	$ 13,807	$ 4,225	$ 1,924
State taxes, net of federal income tax effect	3,974	1,505	1,027
Stock-based compensation	(947)	35	169
Non-deductible expenses	1,129	974	856
Net operating loss carryback	(1,694)	(9,435)	0
Effect of change in tax rate	0	0	0
Accounting method change	0	0	0
Other	1,953	1,139	(220)
Income tax expense	$ 18,222	$ (1,557)	$ 3,756