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FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation of Securities Using Fair Value Hierarchy) (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | $ 12,936,612 | $ 11,072,567
Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 78,721,986 | 85,783,036
Fair Value, Inputs, Level 1 | United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 12,936,612 | 11,072,567
Fair Value, Inputs, Level 1 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 78,721,986 | 85,783,036
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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