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CONTRACTS AND AGREEMENTS (Tables)
 3 Months Ended
Mar. 31, 2019
Contracts and Agreements [Abstract]  
Brokerage Commissions
UNL also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Natural Gas-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”).
 
 
For the three months
ended
March 31, 2019
 
 
For the three months
ended
March 31, 2018
 
Total commissions accrued to brokers
         
 
$
372
 
 
$
318
 
Total commissions as annualized percentage of average total net assets
 
 
0.03
%
 
 
0.02
%
Commissions accrued as a result of rebalancing
 
$
274
 
 
$
185
 
Percentage of commissions accrued as a result of rebalancing
 
 
73.66
%
 
 
58.18
%
Commissions accrued as a result of creation and redemption activity
 
$
98
 
 
$
133
 
Percentage of commissions accrued as a result of creation and redemption activity
 
 
26.34
%
 
 
41.82
%