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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended
Jan. 04, 2018
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Mar. 31, 2020
$ / shares
$ / item
Dec. 31, 2019
$ / shares
Mar. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Jan. 05, 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       $ 12.43 $ 16.91 $ 23.42 $ 24.35  
Number of units issued     200,000          
Value of unit issued | $     $ 10,001,000          
Number of registered units       2,280,000,000        
Issued units               912,318,300
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 Futures Contracts - Long [Member] | United States Contracts | NYMEX Natural Gas Futures Contracts [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure                
Number of Contracts       19,995        
Open 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