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Financial Highlights (Tables)
6 Months Ended
Jun. 30, 2016
Financial Highlights [Abstract]  
Schedule of Financial Highlights
The range of total return for the three and six months ended June 30, 2016 and 2015 were as follows:
 
Six Months Ended June 30,
 
2016
 
2015
Total Return
1.46%
to
1.92%
 
2.20%
to
2.66%
 
Three Months Ended June 30,
 
2016
 
2015
Total Return
0.47%
to
0.69%
 
0.60%
to
0.83%