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1. Summary of Significant Accounting Policies (Details - Earnings Per Share) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Numerator for basic and diluted earnings per share	$ (9,951)	$ 4,663	$ 4,572	$ 4,480	$ 7,465	$ 7,348	$ 7,272	$ 7,214	$ 8,967	$ 8,843	$ 8,537	$ 8,333	$ 3,765	$ 29,300	$ 34,681
Denominator for basic earnings per share - weighted average number of common shares outstanding during the year													22,687	24,356	25,935
Incremental common shares attibutable to exercise of outstanding options and warrants													4,527	4,679	5,649
Denominator for diluted earnings per share													27,214	29,035	31,584
Basic earnings per share	$ (0.46)	$ 0.21	$ 0.20	$ 0.19	$ 0.31	$ 0.31	$ 0.30	$ 0.29	$ 0.35	$ 0.34	$ 0.33	$ 0.33	$ 0.17	$ 1.20	$ 1.34
Diluted earnings per share	$ (0.46)	$ 0.17	$ 0.17	$ 0.16	$ 0.26	$ 0.26	$ 0.25	$ 0.24	$ 0.29	$ 0.28	$ 0.27	$ 0.26	$ 0.14	$ 1.01	$ 1.10

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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