Consolidated Statements of Changes in Members' Capital (Unaudited) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Members' capital, beginning balance	$ 27,654,894	$ 27,020,001	$ 27,978,759	$ 35,044,762	$ 36,765,553	$ 37,181,465	$ 27,978,759	$ 37,181,465
Subscriptions	0	50,000	323,500	0	0	0
Redemptions	(1,453,795)	(1,094,231)	(1,257,799)	(923,376)	(1,151,055)	(1,028,376)
Net income (loss)	1,836,813	1,679,124	(24,459)	225,680	(569,736)	612,464	3,491,478	268,408
Members' capital, ending balance	28,037,912	27,654,894	27,020,001	34,347,066	35,044,762	36,765,553	28,037,912	34,347,066
Class 0 Units [Member]
Members' capital, beginning balance	$ 17,008,343	$ 16,486,750	$ 16,801,362	$ 22,286,065	$ 22,954,767	$ 23,163,675	$ 16,801,362	$ 23,163,675
Members' capital, beginning balance (in units)	119,596.205	123,312.164	125,660.811	157,963.299	160,253.743	164,393.539	125,660.811	164,393.539
Subscriptions	$ 0	$ 50,000	$ 250,000	$ 0	$ 0	$ 0
Subscriptions (in units)	0	373.974	1,882.369	0	0	0
Redemptions	$ (1,249,411)	$ (571,538)	$ (563,529)	$ (733,214)	$ (326,509)	$ (603,688)
Redemptions (in units)	(8,263.487)	(4,089.933)	(4,231.016)	(5,214.164)	(2,290.444)	(4,139.796)
Net income (loss)	$ 1,141,552	$ 1,043,131	$ (1,083)	$ 156,882	$ (342,193)	$ 394,780
Members' capital, ending balance	$ 16,900,484	$ 17,008,343	$ 16,486,750	$ 21,709,733	$ 22,286,065	$ 22,954,767	$ 16,900,484	$ 21,709,733
Members' capital, ending balance (in units)	111,332.718	119,596.205	123,312.164	152,749.135	157,963.299	160,253.743	111,332.718	152,749.135
Class 2 Units [Member]
Members' capital, beginning balance	$ 10,646,551	$ 10,533,251	$ 11,177,397	$ 12,758,697	$ 13,810,786	$ 14,017,790	$ 11,177,397	$ 14,017,790
Members' capital, beginning balance (in units)	104,648.093	109,922.506	116,424.562	125,467.827	133,519.048	137,512.329	116,424.562	137,512.329
Subscriptions	$ 0	$ 0	$ 73,500	$ 0	$ 0	$ 0
Subscriptions (in units)	0	0	775.525	0	0	0
Redemptions	$ (204,384)	$ (522,693)	$ (694,270)	$ (190,162)	$ (824,546)	$ (424,688)
Redemptions (in units)	(1,887.756)	(5,274.413)	(7,277.581)	(1,871.485)	(8,051.221)	(3,993.281)
Net income (loss)	$ 695,261	$ 635,993	$ (23,376)	$ 68,798	$ (227,543)	$ 217,684
Members' capital, ending balance	$ 11,137,428	$ 10,646,551	$ 10,533,251	$ 12,637,333	$ 12,758,697	$ 13,810,786	$ 11,137,428	$ 12,637,333
Members' capital, ending balance (in units)	102,760.337	104,648.093	109,922.506	123,596.342	125,467.827	133,519.048	102,760.337	123,596.342