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Subsequent Events (Details) - USD ($)
2 Months Ended 12 Months Ended
Feb. 27, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Subsequent Events        
Contributions   $ 26,168,269 $ 19,751,210 $ 7,442,700
Redemptions   $ 75,201,808 $ 71,202,429 $ 169,739,371
Subsequent Event        
Subsequent Events        
Contributions $ 1,319,000      
Redemptions $ 4,632,000