STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (NET ASSET VALUE) - USD ($)	General Partner [Member]	Limited Partners [Member]	Total
Balances at Dec. 31, 2015	$ 658,220	$ 544,804,587	$ 545,462,807
Balances (in units) at Dec. 31, 2015	235.103	194,593.327	194,828.430
Increase (Decrease) in Unitholders' Capital [Roll Forward]
Net income (loss)	$ (94,946)	$ (72,227,324)	$ (72,322,270)
Transfers in	$ 0	$ 1,822	$ 1,822
Transfers in (in units)	0.000	0.763	0.763
Transfers out	$ (1,822)	$ 0	$ (1,822)
Transfers out (in units)	(0.763)	(0.000)	(0.763)
Redemptions	$ 0	$ (95,209,967)	$ (95,209,967)
Redemptions (in units)	(0.000)	(37,158.834)	(37,158.834)
Offering costs	$ (1,654)	$ (1,282,472)	$ (1,284,126)
Balances at Dec. 31, 2016	$ 559,798	$ 376,086,646	$ 376,646,444
Balances (in units) at Dec. 31, 2016	234.340	157,435.256	157,669.596
Increase (Decrease) in Unitholders' Capital [Roll Forward]
Net income (loss)	$ (2,255)	$ (2,307,412)	$ (2,309,667)
Redemptions	$ (556,047)	$ (101,945,767)	$ (102,501,814)
Redemptions (in units)	(234.340)	(43,659.532)	(43,893.872)
Offering costs	$ (1,496)	$ (929,363)	$ (930,859)
Balances at Dec. 31, 2017	$ 0	$ 270,904,104	$ 270,904,104
Balances (in units) at Dec. 31, 2017	0.000	113,775.724	113,775.724
Increase (Decrease) in Unitholders' Capital [Roll Forward]
Net income (loss)	$ 0	$ (28,728,209)	$ (28,728,209)
Redemptions	$ 0	$ (54,089,230)	$ (54,089,230)
Redemptions (in units)	(0.000)	(24,672.089)	(24,672.089)
Offering costs	$ 0	$ (840,623)	$ (840,623)
Balances at Dec. 31, 2018	$ 0	$ 187,246,042	$ 187,246,042
Balances (in units) at Dec. 31, 2018	0.000	89,103.635	89,103.635