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FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation of Securities Using Fair Value Hierarchy) (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Short-Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | $ 9,087,304 | $ 11,292,035
Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 9,087,304 | 11,292,035
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 | 0
United States Contracts [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | (313,469) | 2,796,004
United States Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | (313,469) | 2,796,004
United States Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 | 0
United States Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | $ 0 | $ 0

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