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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
Jun. 30, 2019
$ / item
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 1,000
Redemption Baskets [Member]  
Significant Accounting Policies [Line Items]  
Number of units per basket 100,000