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Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Flows from Operating Activities:      
Net Income (Loss) $ (10,398,778) $ 2,786,502 $ 11,003,925
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
(Increase) decrease in commodity futures trading account - cash and cash equivalents 30,603,108 (34,596,432) (4,131,166)
Unrealized loss on futures contracts 2,445,210 11,864,440 4,935,530
(Increase) decrease in dividend receivable (753) 1,988 2,315
(Increase) decrease in interest receivable 14 (14)  
Decrease in other assets 44,010 11,621 6,662
Increase (decrease) in investment payable (33) 33  
Increase (decrease) in professional fees payable (104,591) (12,438) 14,160
Increase (decrease) in General Partner management fees payable (38,796) 7,025 2,703
Increase (decrease) in license fees payable (4,074) (1,338) 108
Decrease in brokerage commissions payable (2,380) (260) (4,250)
Increase (decrease) in directors' fees payable (1,586) 1,294 1,168
Increase in other liabilities   153  
Net cash provided by (used in) operating activities 22,541,351 (19,937,426) 11,831,155
Cash Flows from Financing Activities:      
Addition of partnership units 101,599,752 113,305,191 35,040,868
Redemption of partnership units (161,169,072) (122,583,943) (35,585,972)
Net cash used in financing activities (59,569,320) (9,278,752) (545,104)
Net Increase (Decrease) in Cash and Cash Equivalents (37,027,969) (29,216,178) 11,286,051
Cash and Cash Equivalents, beginning of year 123,736,412 152,952,590 141,666,539
Cash and Cash Equivalents, end of year $ 86,708,443 $ 123,736,412 $ 152,952,590