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Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
oz
Jun. 30, 2022
USD ($)
oz
Mar. 31, 2022
USD ($)
oz
Sep. 30, 2021
USD ($)
oz
Jun. 30, 2021
USD ($)
oz
Mar. 31, 2021
USD ($)
oz
Sep. 30, 2022
USD ($)
oz
Sep. 30, 2021
USD ($)
oz
Beginning balance (Ounce) | oz 16,402,064   15,784,325 16,230,858   16,881,652 15,784,325 16,881,652
Beginning balance, average cost $ 25,199,563,975   $ 23,722,912,868 $ 24,271,632,748   $ 25,014,142,586 $ 23,722,912,868 $ 25,014,142,586
Beginning balance, fair value $ 29,802,548,231   28,729,048,695 [1] $ 28,617,437,101   31,924,891,396 $ 28,729,048,695 [1] $ 31,924,891,396
Gold bullion contributed (Ounce) | oz 39,877     237,945     1,469,368 858,637
Gold bullion contributed, average cost $ 69,345,194     $ 428,654,583     $ 2,786,247,778 $ 1,576,551,832
Gold bullion contributed, fair value $ 69,345,194     $ 428,654,583     $ 2,786,247,778 $ 1,576,551,832
Gold bullion distributed (Ounce) | oz (1,032,942)     (444,564)     (1,824,428) (1,695,683)
Gold bullion distributed, average cost $ (1,587,284,995)     $ (665,324,199)     $ (2,796,723,343) $ (2,525,438,007)
Gold bullion distributed, fair value (1,757,256,432)     (793,300,448)     (3,218,900,462) (2,987,713,104)
Gold bullion distributed, realized gain (loss) $ 169,971,437     $ 127,976,249     $ 422,177,119 $ 462,275,097
Gold bullion sold to pay expenses (Ounce) | oz (10,410)     (10,166)     (30,676) (30,533)
Gold bullion sold to pay expenses, average cost $ (15,995,515)     $ (15,213,954)     $ (46,808,644) $ (45,507,233)
Gold bullion sold to pay expenses, fair value (18,260,882)     (18,313,072)     (55,997,167) (55,531,994)
Gold bullion sold to pay expenses, realized gain (loss) 2,265,367     3,099,118     9,188,523 10,024,761
Net realized gain (loss), fair value 172,236,804 $ 196,914,518 62,214,320 131,075,367 $ 83,087,544 258,136,947 431,365,642 472,299,858
Net change in unrealized appreciation/depreciation, fair value $ (2,526,022,421) $ (2,284,892,586) $ 1,881,741,015 $ (456,228,532) $ 1,053,747,875 $ (3,618,692,332) $ (2,929,173,992) $ (3,021,172,989)
Ending balance (Ounce) | oz 15,398,589 16,402,064   16,014,073 16,230,858   15,398,589 16,014,073
Ending balance, average cost $ 23,665,628,659 $ 25,199,563,975   $ 24,019,749,178 $ 24,271,632,748   $ 23,665,628,659 $ 24,019,749,178
Ending balance, fair value $ 25,742,590,494 [1] $ 29,802,548,231   $ 27,909,324,999 $ 28,617,437,101   $ 25,742,590,494 [1] $ 27,909,324,999
[1] Cost of investment in gold bullion: $23,665,628,659 and $23,722,912,868, respectively.