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Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
oz
Mar. 31, 2024
USD ($)
oz
Jun. 30, 2023
USD ($)
oz
Mar. 31, 2023
USD ($)
oz
Jun. 30, 2024
USD ($)
oz
Jun. 30, 2023
USD ($)
oz
Beginning balance (Ounce) | oz 12,446,196 12,815,382 14,286,334 14,434,521 12,815,382 14,434,521
Beginning balance, average cost $ 19,555,817,449 $ 20,091,705,096 $ 22,113,171,288 $ 22,205,551,004 $ 20,091,705,096 $ 22,205,551,004
Beginning balance, fair value $ 27,560,235,094 26,430,443,509 [1] $ 28,282,655,788 26,160,403,750 $ 26,430,443,509 [1] $ 26,160,403,750
Gold bullion contributed (Ounce) | oz 121,958   424,647   215,610 779,292
Gold bullion contributed, average cost $ 285,503,915   $ 852,839,106   $ 476,001,539 $ 1,536,193,248
Gold bullion contributed, fair value $ 285,503,915   $ 852,839,106   $ 476,001,539 $ 1,536,193,248
Gold bullion distributed (Ounce) | oz (390,459)   (274,793)   (845,482) (768,826)
Gold bullion distributed, average cost $ (614,843,055)   $ (428,666,963)   $ (1,328,963,206) $ (1,190,839,341)
Gold bullion distributed, fair value (904,342,686)   (536,575,410)   (1,836,110,799) (1,452,234,717)
Gold bullion distributed, realized gain (loss) $ 289,499,631   $ 107,908,447   $ 507,147,593 $ 261,395,376
Gold bullion sold to pay expenses (Ounce) | oz (7,645)   (8,995)   (15,460) (17,794)
Gold bullion sold to pay expenses, average cost $ (12,042,309)   $ (13,997,859)   $ (24,307,429) $ (27,559,339)
Gold bullion sold to pay expenses, fair value (17,686,348)   (17,848,718)   (33,741,640) (34,311,365)
Gold bullion sold to pay expenses, realized gain (loss) 5,557,511   3,850,859   9,347,683 6,752,026
Net realized gain 295,057,142       516,495,276 268,147,402
Litigation Proceeds [3] 86,528 [2]   0   86,528 0
Net change in unrealized appreciation/depreciation, fair value $ 1,148,315,128 $ 1,665,679,232 $ (1,104,430,686) $ 2,214,631,754 $ 2,813,994,360 $ 1,110,201,068
Ending balance (Ounce) | oz 12,170,050 12,446,196 14,427,193 14,286,334 12,170,050 14,427,193
Ending balance, average cost $ 19,214,436,000 $ 19,555,817,449 $ 22,523,345,572 $ 22,113,171,288 $ 19,214,436,000 $ 22,523,345,572
Ending balance, fair value 28,367,168,773 [1] 27,560,235,094 27,588,399,386 28,282,655,788 28,367,168,773 [1] 27,588,399,386
Ending balance, realized gain (loss) 295,057,142       516,495,276 268,147,402
Net realized gain (loss), fair value 295,143,670 221,438,134 111,759,306 156,388,096 516,581,804 268,147,402
Ending balance, realized gain (loss) 295,143,670 $ 221,438,134 111,759,306 $ 156,388,096 516,581,804 268,147,402
Gain (Loss) from Litigation Settlement [3] $ 86,528 [2]   $ 0   $ 86,528 $ 0
[1] Cost of investment in gold bullion: $19,214,436,000 and $20,091,705,096, respectively.
[2] Includes a payment received from a class action settlement related to gold of $86,528.
[3] Represents a payment received from a class action settlement related to gold.