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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details)	Mar. 31, 2019 $ / Units
Significant Accounting Policies [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets	350
Creation Baskets
Significant Accounting Policies [Line Items]
Number of Shares per basket	50,000
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets	50,000
Prior to July 1, 2011
Significant Accounting Policies [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets	350