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Consolidated Statements of Financial Condition (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Purchased options on futures contracts, premiums paid $ 37,722 $ 33,376
Fixed income securities, cost 22,676,316 21,993,704
Options written on futures contracts, premiums   $ 14,375
Trading
   
Unitholders' capital, units outstanding 345,889 369,090
LLC equity/Non-Trading
   
Unitholders' capital, units outstanding 2,273,288 2,273,288
LLC equity/Non-Trading | Participating owners
   
Unitholders' capital, units outstanding 287,669 306,807
LLC equity/Non-Trading | Nonparticipating owners
   
Unitholders' capital, units outstanding 1,985,619 1,966,481
Class A | Trading | Beneficial owners
   
Unitholders' capital, units outstanding 334,053 355,858
Class A | Trading | Managing owner
   
Unitholders' capital, units outstanding 535 535
Class B | Trading | Beneficial owners
   
Unitholders' capital, units outstanding 11,301 12,697