Statements of Cash Receipts and Disbursements (Unaudited) (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Statements of Cash Receipts and Disbursements [Abstract]
Disbursements made for trustee and transfer agent fees		$ 4,375		$ 4,375
Number of units outstanding	277,712	277,712	277,712	277,712