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13. STOCK-BASED COMPENSATION (Details Narrative) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation [Abstract] |  |
Aggregate intrinsic value of options outstanding and exercisable | $ 1,639,182 |
Intrinsic value of options exercised | $ 236,535 | $ 400,954
Issued common stock upon cashless exercise, shares | 182,500 | 223,000
Issued common stock upon cashless exercise, option | $ 145,813 | $ 97,244

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