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Statements of Operations (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$ (6,344,216)us-gaap_GainLossOnSaleOfInvestments	$ 525,150us-gaap_GainLossOnSaleOfInvestments
Change in unrealized gain (loss) on open positions	1,240,277us-gaap_UnrealizedGainLossOnInvestments	1,106,210us-gaap_UnrealizedGainLossOnInvestments
Dividend income	1,776us-gaap_DividendIncomeOperating	3,037us-gaap_DividendIncomeOperating
Interest income	4,053us-gaap_InterestIncomeOperating	1,828us-gaap_InterestIncomeOperating
ETF transaction fees	5,950us-gaap_OtherIncome	700us-gaap_OtherIncome
Total income (loss)	(5,092,160)us-gaap_Revenues	1,636,925us-gaap_Revenues
Expenses
General Partner management fees (Note 3)	92,815us-gaap_AssetManagementCosts	86,453us-gaap_AssetManagementCosts
Professional fees	20,619us-gaap_ProfessionalFees	51,393us-gaap_ProfessionalFees
Brokerage commissions	6,437us-gaap_FloorBrokerageExchangeAndClearanceFees	1,400us-gaap_FloorBrokerageExchangeAndClearanceFees
Directors' fees and insurance	2,905us-gaap_NoninterestExpenseDirectorsFees	4,177us-gaap_NoninterestExpenseDirectorsFees
License fees	2,320us-gaap_LicenseCosts	2,161us-gaap_LicenseCosts
Total expenses	125,096us-gaap_OperatingExpenses	145,584us-gaap_OperatingExpenses
Net income (loss)	$ (5,217,256)us-gaap_NetIncomeLoss	$ 1,491,341us-gaap_NetIncomeLoss
Net income (loss) per limited partnership share	$ (2.63)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.27us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Net income (loss) per weighted average limited partnership share	$ (2.08)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	$ 1.09us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted
Weighted average limited partnership shares outstanding	2,506,111us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding	1,371,667us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding

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