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ORGANIZATION AND BUSINESS (Details) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2009 shares | Nov. 18, 2009 USD ($) $ / shares shares | Dec. 31, 2021 $ / shares $ / item shares | Dec. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares
ORGANIZATION AND BUSINESS |  |  |  |  |  |
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / item |  |  | 350 |  |  |
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission | 30,000,000 |  |  |  |  |
Net asset value per share | $ / shares |  | $ 50.00 | $ 11.65 | $ 7.74 | $ 8.43 | $ 10.26
Number of units issued |  | 200,000 |  |  |  |
Value of unit issued | $ |  | $ 10,000,000 |  |  |  |
Commenced investment operations date | Nov. 18, 2009 |  |  |  |  |
Number of registered units |  |  | 30,000,000 |  |  |
Creation Baskets [Member] |  |  |  |  |  |
ORGANIZATION AND BUSINESS |  |  |  |  |  |
Number of units per basket | $ / item |  |  | 50,000 |  |  |

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