Consolidated Statements of Unitholders' Capital (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Balances at December 31, 2012		$ 23,250,458
Income (loss)	(907,796)	(1,320,259)
Balances at June 30, 2013	19,473,425	19,473,425
Beneficial Owners -Trading Class A [Member] | Limited Partner [Member]
Balances at December 31, 2012		21,106,894
Balances at December 31, 2012 (in Shares)		274,403
Income (loss)		(1,120,592)
Transfer from Class A to Class B		(1,832)
Transfer from Class A to Class B (in Shares)		(24)
Unitholders' redemptions		(2,275,090)
Unitholders' redemptions (in Shares)		(30,274)
Balances at June 30, 2013	17,709,380	17,709,380
Balances at June 30, 2013 (in Shares)	244,105	244,105
Beneficial Owners - Trading Class B [Member] | Limited Partner [Member]
Balances at December 31, 2012		675,323
Balances at December 31, 2012 (in Shares)		8,103
Income (loss)		(25,349)
Transfer from Class A to Class B		1,832
Transfer from Class A to Class B (in Shares)		22
Unitholders' redemptions		(181,684)
Unitholders' redemptions (in Shares)		(2,203)
Balances at June 30, 2013	470,122	470,122
Balances at June 30, 2013 (in Shares)	5,922	5,922
Managing Owners - Trading Class A [Member] | General Partner [Member]
Balances at December 31, 2012		41,153
Balances at December 31, 2012 (in Shares)		535
Income (loss)		(2,339)
Balances at June 30, 2013	38,814	38,814
Balances at June 30, 2013 (in Shares)	535	535
Unitholders' Capital - Trading [Member]
Balances at December 31, 2012		21,823,370
Balances at December 31, 2012 (in Shares)		283,041
Income (loss)		1,148,280
Transfer from Class A to Class B (in Shares)		(2)
Unitholders' redemptions		2,456,774
Unitholders' redemptions (in Shares)		(32,477)
Balances at June 30, 2013	18,218,316	18,218,316
Balances at June 30, 2013 (in Shares)	250,562	250,562
Participating Owners - LLC Equity/Non-Trading [Member] | Limited Partner [Member]
Balances at December 31, 2012		149,728
Balances at December 31, 2012 (in Shares)		237,663
Income (loss)		(18,035)
Unitholders' redemptions		(12,403)
Unitholders' redemptions (in Shares)		(21,863)
Balances at June 30, 2013	119,290	119,290
Balances at June 30, 2013 (in Shares)	215,800	215,800
Nonparticipating Owners - LLC Equity/Non-Trading [Member] | Limited Partner [Member]
Balances at December 31, 2012		1,277,360
Balances at December 31, 2012 (in Shares)		2,035,625
Income (loss)		(153,944)
Unitholders' redemptions		12,403
Unitholders' redemptions (in Shares)		21,863
Balances at June 30, 2013	1,135,819	1,135,819
Balances at June 30, 2013 (in Shares)	2,057,488	2,057,488
Unitholders' Capital - LLC Equity/Non-Trading [Member]
Balances at December 31, 2012		1,427,088
Balances at December 31, 2012 (in Shares)		2,273,288
Income (loss)		(171,979)
Balances at June 30, 2013	$ 1,255,109	$ 1,255,109
Balances at June 30, 2013 (in Shares)	2,273,288	2,273,288
Net asset value per unit at December 31, 2012 (in Dollars per share)		$ 0.63
Net change per unit (in Dollars per share)		$ (0.08)
Net asset value per unit at June 30, 2013 (in Dollars per share)	$ 0.55	$ 0.55
Unitholders' Capital - Trading Class A [Member]
Net asset value per unit at December 31, 2012 (in Dollars per share)		$ 76.92
Net change per unit (in Dollars per share)		$ (4.37)
Net asset value per unit at June 30, 2013 (in Dollars per share)	$ 72.55	$ 72.55
Unitholders' Capital - Trading Class B [Member]
Net asset value per unit at December 31, 2012 (in Dollars per share)		$ 83.34
Net change per unit (in Dollars per share)		$ (3.96)
Net asset value per unit at June 30, 2013 (in Dollars per share)	$ 79.38	$ 79.38