Consolidated Statements of Changes in Members' Capital (Unaudited) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Members' capital, beginning balance	$ 27,020,001	$ 27,978,759	$ 36,765,553	$ 37,181,465	$ 27,978,759	$ 37,181,465
Subscriptions	50,000	323,500	0	0
Redemptions	(1,094,231)	(1,257,799)	(1,151,055)	(1,028,376)
Net income (loss)	1,679,124	(24,459)	(569,736)	612,464	1,654,665	42,728
Members' capital, ending balance	27,654,894	27,020,001	35,044,762	36,765,553	27,654,894	35,044,762
Class 0 Units [Member]
Members' capital, beginning balance	$ 16,486,750	$ 16,801,362	$ 22,954,767	$ 23,163,675	$ 16,801,362	$ 23,163,675
Members' capital, beginning balance (in units)	123,312.164	125,660.811	160,253.743	164,393.539	125,660.811	164,393.539
Subscriptions	$ 50,000	$ 250,000	$ 0	$ 0
Subscriptions (in units)	373.974	1,882.369	0	0
Redemptions	$ (571,538)	$ (563,529)	$ (326,509)	$ (603,688)
Redemptions (in units)	(4,089.933)	(4,231.016)	(2,290.444)	(4,139.796)
Net income (loss)	$ 1,043,131	$ (1,083)	$ (342,193)	$ 394,780
Members' capital, ending balance	$ 17,008,343	$ 16,486,750	$ 22,286,065	$ 22,954,767	$ 17,008,343	$ 22,286,065
Members' capital, ending balance (in units)	119,596.205	123,312.164	157,963.299	160,253.743	119,596.205	157,963.299
Class 2 Units [Member]
Members' capital, beginning balance	$ 10,533,251	$ 11,177,397	$ 13,810,786	$ 14,017,790	$ 11,177,397	$ 14,017,790
Members' capital, beginning balance (in units)	109,922.506	116,424.562	133,519.048	137,512.329	116,424.562	137,512.329
Subscriptions	$ 0	$ 73,500	$ 0	$ 0
Subscriptions (in units)	0	775.525	0	0
Redemptions	$ (522,693)	$ (694,270)	$ (824,546)	$ (424,688)
Redemptions (in units)	(5,274.413)	(7,277.581)	(8,051.221)	(3,993.281)
Net income (loss)	$ 635,993	$ (23,376)	$ (227,543)	$ 217,684
Members' capital, ending balance	$ 10,646,551	$ 10,533,251	$ 12,758,697	$ 13,810,786	$ 10,646,551	$ 12,758,697
Members' capital, ending balance (in units)	104,648.093	109,922.506	125,467.827	133,519.048	104,648.093	125,467.827