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Subsequent Events (Details) - USD ($)
12 Months Ended
Jan. 01, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Subsequent Events        
Contributions   $ 19,751,210 $ 7,442,700 $ 28,057,907
Redemptions   $ 71,202,429 $ 169,739,371 $ 193,063,119
Subsequent Event        
Subsequent Events        
Contributions $ 3,028,000      
Redemptions $ 6,918,000