FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation of Securities Using Fair Value Hierarchy) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ 23,922,430	$ 12,278,369
Exchange-Traded Futures Contracts | United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(906,580)	(8,583,320)
Fair Value, Inputs, Level 1 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	23,922,430	12,278,369
Fair Value, Inputs, Level 1 | Exchange-Traded Futures Contracts | United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(906,580)	(8,583,320)
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts | United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts | United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ 0	$ 0