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Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
oz
Mar. 31, 2025
USD ($)
oz
Jun. 30, 2024
USD ($)
oz
Mar. 31, 2024
USD ($)
oz
Jun. 30, 2025
USD ($)
oz
Jun. 30, 2024
USD ($)
oz
Beginning balance (Ounce) | oz 13,660,113 12,625,208 12,446,196 12,815,382 12,625,208 12,815,382
Beginning balance, average cost $ 24,364,279,998 $ 21,152,229,978 $ 19,555,817,449 $ 20,091,705,096 $ 21,152,229,978 $ 20,091,705,096
Beginning balance, fair value $ 42,552,619,573 32,962,525,082 [1] $ 27,560,235,094 26,430,443,509 $ 32,962,525,082 [1] $ 26,430,443,509
Gold bullion contributed (Ounce) | oz 900,634   121,958   2,109,281 215,610
Gold bullion contributed, average cost $ 2,954,072,248   $ 285,503,915   $ 6,466,275,204 $ 476,001,539
Gold bullion contributed, fair value $ 2,954,072,248   $ 285,503,915   $ 6,466,275,204 $ 476,001,539
Gold bullion distributed (Ounce) | oz (344,212)   (390,459)   (510,280) (845,482)
Gold bullion distributed, average cost $ (631,434,980)   $ (614,843,055)   $ (918,533,887) $ (1,328,963,206)
Gold bullion distributed, fair value (1,111,940,461)   (904,342,686)   (1,586,157,799) (1,836,110,799)
Gold bullion distributed, realized gain (loss) $ 480,505,481   $ 289,499,631   $ 667,623,912 $ 507,147,593
Gold bullion sold to pay expenses (Ounce) | oz (8,464)   (7,645)   (16,138) (15,460)
Gold bullion sold to pay expenses, average cost $ (15,425,065)   $ (12,042,309)   $ (28,479,094) $ (24,307,429)
Gold bullion sold to pay expenses, fair value (27,446,133)   (17,686,348)   (48,786,631) (33,741,640)
Gold bullion sold to pay expenses, realized gain (loss) 12,021,068   5,557,511   20,307,537 9,347,683
Net realized gain, fair value 492,526,549   295,057,142   687,931,449 516,495,276
Net change in unrealized appreciation/depreciation, fair value $ 1,848,491,660 $ 6,378,044,471 $ 1,148,315,128 $ 1,665,679,232 $ 8,226,536,131 $ 2,813,994,360
Ending balance (Ounce) | oz 14,208,071 13,660,113 12,170,050 12,446,196 14,208,071 12,170,050
Ending balance, average cost $ 26,671,492,201 $ 24,364,279,998 $ 19,214,436,000 $ 19,555,817,449 $ 26,671,492,201 $ 19,214,436,000
Ending balance, fair value 46,708,323,436 [1] $ 42,552,619,573 28,367,168,773 $ 27,560,235,094 46,708,323,436 [1] 28,367,168,773
Ending balance, realized gain (loss) 492,526,549   295,057,142   687,931,449 516,495,276
Litigation Proceeds [2] 0   86,528 [3]   0 86,528 [3]
Gain (Loss) from Litigation Settlement [2] $ 0   $ 86,528 [3]   $ 0 $ 86,528 [3]
[1] Cost of investment in gold bullion: $26,671,492,201 and $21,152,229,978, respectively.
[2] Represents a payment received from a class action settlement related to gold.
[3] Includes a payment received from a class action settlement related to gold of $86,528.