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Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)
 3 Months Ended
Mar. 31, 2026
USD ($)
oz
Mar. 31, 2025
USD ($)
oz
Beginning balance (Ounce) | oz 1,399,628 520,730
Beginning balance, average cost $ 4,282,709,201 $ 1,038,334,101
Beginning balance, fair value $ 6,029,526,835 [1] $ 1,359,548,424
Gold bullion contributed (Ounce) | oz 195,368 226,910
Gold bullion contributed, average cost $ 955,767,155 $ 662,331,197
Gold bullion contributed, fair value $ 955,767,155 $ 662,331,197
Gold bullion distributed (Ounce) | oz (42,359) (60,345)
Gold bullion distributed, average cost $ (138,996,598) $ (126,061,049)
Gold bullion distributed, fair value (193,545,801) (171,439,526)
Gold bullion distributed, realized gain (loss) $ 54,549,203 $ 45,378,477
Gold bullion sold to pay expenses (Ounce) | oz (245) (90)
Gold bullion sold to pay expenses, average cost $ (779,981) $ (187,262)
Gold bullion sold to pay expenses, fair value (1,174,926) (251,465)
Gold bullion sold to pay expenses, realized gain (loss) 394,945 64,203
Net realized gain (loss), fair value 54,944,148 45,442,680
Net change in unrealized appreciation/depreciation, fair value $ 308,447,460 $ 245,081,509
Ending balance (Ounce) | oz 1,552,392 687,205
Ending balance, average cost $ 5,098,699,777 $ 1,574,416,987
Ending balance, fair value 7,153,964,871 [1] 2,140,712,819
Ending balance, realized gain (loss) $ 54,944,148 $ 45,442,680
[1] Cost of investment in gold bullion: $5,098,699,777 and $4,282,709,201, respectively.