Statements of Members' Capital (USD $)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Increase (Decrease) in Members' Capital [Roll Forward]
Members Capital, beginning of period		$ 34,332,043	$ 39,121,909	$ 39,121,909
Investor Member Shares, outstanding, beginning of period		51,854
Net loss	(212,518)	(616,332)	4,546,682	2,210,134
Distributions				(7,000,000)
Members Capital, end of period	33,715,711	33,715,711		34,332,043
Investor Member Shares, outstanding, end of period	51,854	51,854		51,854
Sponsoring Member
Increase (Decrease) in Members' Capital [Roll Forward]
Members Capital, beginning of period		959,727	959,727	959,727
Net loss		0		0
Members Capital, end of period	959,727	959,727		959,727
Investor Members
Increase (Decrease) in Members' Capital [Roll Forward]
Members Capital, beginning of period		33,372,316	38,162,182	38,162,182
Investor Member Shares, outstanding, beginning of period		51,854	51,854	51,854
Net loss		(616,332)		2,210,134
Distributions				(7,000,000)
Members Capital, end of period	$ 32,755,984	$ 32,755,984		$ 33,372,316
Investor Member Shares, outstanding, end of period	51,854	51,854		51,854