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Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
oz
Jun. 30, 2024
USD ($)
oz
Mar. 31, 2024
USD ($)
oz
Sep. 30, 2023
USD ($)
oz
Jun. 30, 2023
USD ($)
oz
Mar. 31, 2023
USD ($)
oz
Sep. 30, 2024
USD ($)
oz
Sep. 30, 2023
USD ($)
oz
Beginning balance (Ounce) | oz 515,421   592,464 479,333   622,347 592,464 622,347
Beginning balance, average cost $ 985,998,676   $ 1,105,542,600 $ 874,314,966   $ 1,120,732,110 $ 1,105,542,600 $ 1,120,732,110
Beginning balance, fair value $ 1,201,394,958   1,221,895,792 [1] $ 916,602,313   1,127,908,719 $ 1,221,895,792 [1] $ 1,127,908,719
Gold bullion contributed (Ounce) | oz 44,401     31,451     112,266 122,836
Gold bullion contributed, average cost $ 108,832,468     $ 60,575,037     $ 260,347,366 $ 238,246,300
Gold bullion contributed, fair value $ 108,832,468     $ 60,575,037     $ 260,347,366 $ 238,246,300
Gold bullion distributed (Ounce) | oz (7,982)     (48,426)     (152,717) (282,635)
Gold bullion distributed, average cost $ (15,596,465)     $ (88,478,230)     $ (286,330,664) $ (512,223,346)
Gold bullion distributed, fair value (20,321,080)     (93,181,920)     (325,024,401) (540,532,873)
Gold bullion distributed, realized gain (loss) $ 4,724,615     $ 4,703,690     $ 38,693,737 $ 28,309,527
Gold bullion sold to pay expenses (Ounce) | oz (91)     (84)     (264) (274)
Gold bullion sold to pay expenses, average cost $ (176,132)     $ (154,226)     $ (500,755) $ (497,517)
Gold bullion sold to pay expenses, fair value (220,933)     (163,716)     (596,904) (528,817)
Gold bullion sold to pay expenses, realized gain (loss) 44,801     9,490     96,149 31,300
Net realized gain (loss), fair value 4,769,416 $ 9,175,001 24,845,469 4,713,180 $ 9,044,241 14,583,406 38,789,886 28,340,827
Net change in unrealized appreciation/depreciation, fair value $ 156,618,421 $ 48,899,779 50,143,311 $ (23,862,569) $ (42,090,064) 77,200,802 $ 255,661,511 $ 11,248,169
Ending balance (Ounce) | oz 551,749 515,421   462,274 479,333   551,749 462,274
Ending balance, average cost $ 1,079,058,547 $ 985,998,676   $ 846,257,547 $ 874,314,966   $ 1,079,058,547 $ 846,257,547
Ending balance, fair value 1,451,073,250 [1] 1,201,394,958   864,682,325 916,602,313   1,451,073,250 [1] 864,682,325
Ending balance, realized gain (loss) $ 4,769,416 $ 9,175,001 $ 24,845,469 $ 4,713,180 $ 9,044,241 $ 14,583,406 $ 38,789,886 $ 28,340,827
[1] Cost of investment in gold bullion: $1,079,058,547 and $1,105,542,600, respectively.