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1. NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Net income	$ 17,871,795us-gaap_NetIncomeLoss	$ 20,967,358us-gaap_NetIncomeLoss
Basic: Weighted-average common shares outstanding during the year	38,694,567us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,395,921us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add: Dilutive effect of stock options	566,060us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	431,409us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted	39,260,627us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	38,827,330us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.55us-gaap_EarningsPerShareBasic
Diluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.54us-gaap_EarningsPerShareDiluted

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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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