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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended 9 Months Ended
Jan. 04, 2018
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Sep. 30, 2020
$ / shares
$ / item
Jun. 30, 2020
$ / shares
Dec. 31, 2019
$ / shares
Sep. 30, 2019
$ / shares
Jun. 30, 2019
$ / shares
Dec. 31, 2018
$ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / item       1,000          
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission   30,000,000              
Net Asset Value Per Unit | $ / shares       $ 11.35 $ 10.25 $ 16.91 $ 19.93 $ 19.83 $ 24.35
Number of units issued     200,000            
Value of unit issued | $     $ 10,001,000            
Number of registered units       2,280,000          
Issued units 912,318,300                
Number of successive valuation days       30 days          
Average daily percentage change in the price of the Benchmark Futures Contract considered       10.00%          
Prior to Reverse Split [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Net Asset Value Per Unit | $ / shares $ 5.69   $ 50.00            
Issued units 97,466,476                
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.25                
Following Reverse Split [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Net Asset Value Per Unit | $ / shares $ 22.76                
Capital Units, Outstanding 24,366,619                
Creation Baskets [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Number of units per basket | $ / item       100,000          
Redemption Baskets [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Number of units per basket | $ / item       100,000          
Open Commodity Futures Contracts, Long [Member] | United States Contracts | NYMEX Natural Gas Futures Contracts [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Number of Contracts       12,526          
Open Commodity Futures Contracts, Long [Member] | United States Contracts | ICE Natural Gas Futures LD1 H Contracts [Member]                  
Organization, Consolidation and Presentation of Financial Statements Disclosure                  
Number of Contracts       0