1. Summary of Significant Accounting Policies (Details - Earnings per share) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings per share:
Numerator for basic and diluted earnings per share	$ 8,967	$ 8,843	$ 8,537	$ 8,333	$ 8,010	$ 7,776	$ 7,026	$ 6,705	$ 6,522	$ 5,873	$ 4,825	$ 3,785	$ 34,681	$ 29,516	$ 21,005
Denominator for basic earnings per share - weighted average number of common shares outstanding during the year													25,935,000	25,040,000	21,538,000
Incremental common shares attibutable to exercise of outstanding options and warrants													5,649,000	6,992,000	10,036,000
Denominator for diluted earnings per share													31,584,000	32,032,000	31,574,000
Basic earnings per share	$ .35	$ .34	$ .33	$ .33	$ 0.31	$ 0.31	$ 0.28	$ 0.28	$ 0.28	$ 0.27	$ 0.23	$ 0.19	$ 1.34	$ 1.18	$ 0.98
Diluted earnings per share	$ .29	$ .28	$ .27	$ .26	$ 0.25	$ 0.24	$ 0.22	$ 0.21	$ 0.21	$ 0.19	$ 0.15	$ 0.12	$ 1.10	$ 0.92	$ 0.67