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8. COMMODITIES HELD BY BROKER (Details 1) (USD $)
3 Months Ended 9 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Commodities Held By Broker Details        
Gross realized gains $ 2,698,809 $ 611,696 $ 3,187,914 $ 2,464,269
Gross realized losses (2,576,080) (855,906) (4,774,068) (861,140)
Unrealized gains (losses) 404,643 (1,202,443) 1,701,256 (1,154,558)
Total $ 527,372 $ (1,446,653) $ 115,102 $ 448,571