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1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator
Net income	$ 13,197,019	$ 10,775,260	$ 19,663,983	$ 16,090,531
Denominator
Basic: Weighted-average common shares outstanding during the period	46,008,102	45,928,234	46,007,611	44,313,537
Add: Dilutive effect of stock options	622,989	1,214,839	678,098	1,005,671
Diluted	46,631,091	47,143,073	46,685,709	45,319,208
Net income per share
Basic	$ 0.29	$ 0.23	$ 0.43	$ 0.36
Diluted	$ 0.28	$ 0.23	$ 0.42	$ 0.36

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