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Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
oz
Beginning balance (Ounce) | oz 479,334
Beginning balance, average cost $ 858,638,067
Beginning balance, fair value $ 872,434,117 [1]
Gold bullion contributed (Ounce) | oz 228,895
Gold bullion contributed, average cost $ 421,813,732
Gold bullion contributed, fair value $ 421,813,732
Gold bullion distributed (Ounce) | oz (25,486)
Gold bullion distributed, average cost $ (45,830,883)
Gold bullion distributed, fair value (49,444,381)
Gold bullion distributed, realized gain (loss) $ 3,613,498
Gold bullion sold to pay expenses (Ounce) | oz (96)
Gold bullion sold to pay expenses, average cost $ (172,868)
Gold bullion sold to pay expenses, fair value (177,684)
Gold bullion sold to pay expenses, realized gain (loss) 4,816
Net realized gain (loss), fair value 3,618,314
Net change in unrealized appreciation/depreciation, fair value $ 77,556,610
Ending balance (Ounce) | oz 682,647
Ending balance, average cost $ 1,234,448,048
Ending balance, fair value 1,325,800,708 [1]
Ending balance, realized gain (loss) $ 3,618,314
[1] Cost of investment in gold bullion: $1,234,448,048 and $858,638,067, respectively.