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FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation of Securities Using Fair Value Hierarchy) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | $ 11,072,567 | $ 17,277,775
Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 85,783,036 | 106,896,715
Fair Value, Inputs, Level 1 | United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 11,072,567 | 17,277,775
Fair Value, Inputs, Level 1 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 85,783,036 | 106,896,715
Fair Value, Inputs, Level 2 | United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 2 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 3 | United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 3 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | $ 0 | $ 0

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