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Fees and Related Party Transactions (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Advisory Fees [Abstract]            
Advisory fees       $ 523,762 $ 823,044  
Advisory fees at annual rate of net asset value of fund     1.75%     1.50%
Sponsor Fees [Abstract]            
Sponsor Fees       $ 272,976 $ 482,788  
Percentage of incentive allocation       20.00% 20.00%  
Incentive Allocation allocated to the Fund by GAIT       $ 0 $ 0  
Administrator's Fee [Abstract]            
Administrator's fees       $ 45,411 $ 66,702  
Class 0 Units [Member]            
Sponsor Fees [Abstract]            
Sponsor fees at annual rate of net asset value of fund 0.75% 0.75%       0.50%
Class 2 Units [Member]            
Sponsor Fees [Abstract]            
Sponsor fees at annual rate of net asset value of fund 1.50% 2.75%       1.25%