001 - Statement - STATEMENTS OF ASSETS, LIABILITIES AND TRUST CORPUS link:presentationLink link:definitionLink link:calculationLink 002 - Statement - STATEMENTS OF REVENUE COLLECTED AND EXPENSES PAID link:presentationLink link:definitionLink link:calculationLink 003 - Statement - STATEMENTS OF UNDISTRIBUTED EARNINGS link:presentationLink link:definitionLink link:calculationLink 004 - Statement - STATEMENTS OF CHANGES IN CASH AND CASH EQUIVALENTS link:presentationLink link:definitionLink link:calculationLink 005 - Disclosure - Summary of significant accounting policies link:presentationLink link:definitionLink link:calculationLink 006 - Disclosure - Formation of the Trust link:presentationLink link:definitionLink link:calculationLink 007 - Disclosure - Related party transactions link:presentationLink link:definitionLink link:calculationLink 008 - Disclosure - Employee benefit plan link:presentationLink link:definitionLink link:calculationLink 996000 - Disclosure - Accounting Policies, by Policy (Policies) link:presentationLink link:definitionLink link:calculationLink 996001 - Disclosure - Summary of significant accounting policies (Details) link:presentationLink link:definitionLink link:calculationLink 996002 - Disclosure - Related party transactions (Details) link:presentationLink link:definitionLink link:calculationLink 996003 - Disclosure - Employee benefit plan (Details) link:presentationLink link:definitionLink link:calculationLink 000 - Document - Document and Entity Information link:presentationLink link:definitionLink link:calculationLink