(1) Summary of Significant Accounting Policies (Details - Earning per share) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Numerator for basic and diluted earnings per share	$ 21,677	$ 5,406	$ 14,862
Denominator for basic earnings per share - weighted average number of common shares outstanding during the year	22,611	22,416	21,989
Incremental common shares attributable to exercise of outstanding options and warrants	1,392	1,648	2,999
Denominator for diluted earnings per share	24,003	24,064	24,988
Basic earnings per share	$ 0.96	$ 0.24	$ 0.68
Diluted earnings per share	$ 0.90	$ 0.22	$ 0.59