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FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation of Securities Using Fair Value Hierarchy) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
United States    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Investments, Fair Value Disclosure $ 17,277,775 $ (19,971,629)
Short-Term Investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Investments, Fair Value Disclosure 106,896,715 52,963,042
Fair Value, Inputs, Level 1 | United States    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Investments, Fair Value Disclosure 17,277,775 (19,971,629)
Fair Value, Inputs, Level 1 | Short-Term Investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Investments, Fair Value Disclosure 106,896,715 52,963,042
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