XML 33 R18.htm IDEA: XBRL DOCUMENT v3.10.0.1
Significant Accounting Policies (Categorization Of The Trust's Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in gold $ 822,113 $ 1,048,326