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Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
oz
Mar. 31, 2023
USD ($)
oz
Jun. 30, 2022
USD ($)
oz
Mar. 31, 2022
USD ($)
oz
Jun. 30, 2023
USD ($)
oz
Jun. 30, 2022
USD ($)
oz
Beginning balance (Ounce) | oz 486,907 622,347 682,647 479,334 622,347 479,334
Beginning balance, average cost $ 879,552,058 $ 1,120,732,110 $ 1,234,448,048 $ 858,638,067 $ 1,120,732,110 $ 858,638,067
Beginning balance, fair value $ 963,929,469 1,127,908,719 [1] $ 1,325,800,708 872,434,117 $ 1,127,908,719 [1] $ 872,434,117
Gold bullion contributed (Ounce) | oz 51,432   0   91,385 228,895
Gold bullion contributed, average cost $ 102,276,250   $ 0   $ 177,671,263 $ 421,813,732
Gold bullion contributed, fair value $ 102,276,250   $ 0   $ 177,671,263 $ 421,813,732
Gold bullion distributed (Ounce) | oz (58,918)   (112,427)   (234,209) (137,913)
Gold bullion distributed, average cost $ (107,353,087)   $ (203,303,760)   $ (423,745,116) $ (249,134,643)
Gold bullion distributed, fair value (116,382,514)   (210,394,492)   (447,350,953) (259,838,873)
Gold bullion distributed, realized gain (loss) $ 9,029,427   $ 7,090,732   $ 23,605,837 $ 10,704,230
Gold bullion sold to pay expenses (Ounce) | oz (88)   (116)   (190) (212)
Gold bullion sold to pay expenses, average cost $ (160,255)   $ (209,456)   $ (343,291) $ (382,324)
Gold bullion sold to pay expenses, fair value (175,069)   (218,023)   (365,101) (395,707)
Gold bullion sold to pay expenses, realized gain (loss) 14,814   8,567   21,810 13,383
Net realized gain (loss), fair value 9,044,241 14,583,406 7,099,299 3,618,314 23,627,647 10,717,613
Net change in unrealized appreciation/depreciation, fair value $ (42,090,064) $ 77,200,802 $ (86,409,036) $ 77,556,610 $ 35,110,738 $ (8,852,426)
Ending balance (Ounce) | oz 479,333 486,907 570,104 682,647 479,333 570,104
Ending balance, average cost $ 874,314,966 $ 879,552,058 $ 1,030,934,832 $ 1,234,448,048 $ 874,314,966 $ 1,030,934,832
Ending balance, fair value 916,602,313 [1] 963,929,469 1,035,878,456 1,325,800,708 916,602,313 [1] 1,035,878,456
Ending balance, realized gain (loss) $ 9,044,241 $ 14,583,406 $ 7,099,299 $ 3,618,314 $ 23,627,647 $ 10,717,613
[1] Cost of investment in gold bullion: $874,314,966 and $1,120,732,110, respectively.