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LICENSE AGREEMENT (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
LICENSE AGREEMENT |  |  |
Royalty fees | $ 2,864,188 | $ 2,527,508 | $ 2,477,583
Licensing Agreements |  |  |
LICENSE AGREEMENT |  |  |
Initial licensing fee | $ 500,000 |  |
Amortization period of license fee | 17 years |  |
Quarterly payments as a percentage of royalty fee on gross sales | 5.00% |  |
Royalty fees | $ 2,864,188 | 2,527,508 | 2,477,583
Royalty payable under the license agreement | 793,489 | 659,443 |
Gross sales upon which royalties are based | $ 57,283,780 | $ 50,550,165 | $ 49,551,660

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