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Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
oz
Mar. 31, 2021
USD ($)
oz
Beginning balance (Ounce) | oz 15,784,325 16,881,652
Beginning balance, average cost $ 23,722,912,868 $ 25,014,142,586
Beginning balance, fair value $ 28,729,048,695 [1] $ 31,924,891,396
Gold bullion contributed (Ounce) | oz 1,016,179 290,219
Gold bullion contributed, average cost $ 1,934,507,346 $ 533,856,902
Gold bullion contributed, fair value $ 1,934,507,346 $ 533,856,902
Gold bullion distributed (Ounce) | oz (182,546) (959,139)
Gold bullion distributed, average cost $ (274,923,450) $ (1,425,654,761)
Gold bullion distributed, fair value (333,921,344) (1,680,026,988)
Gold bullion distributed, realized gain (loss) $ 58,997,894 $ 254,372,227
Gold bullion sold to pay expenses (Ounce) | oz (9,648) (10,387)
Gold bullion sold to pay expenses, average cost $ (14,545,433) $ (15,425,968)
Gold bullion sold to pay expenses, fair value (17,761,859) (19,190,688)
Gold bullion sold to pay expenses, realized gain (loss) 3,216,426 3,764,720
Net realized gain (loss), fair value 62,214,320 258,136,947
Net change in unrealized appreciation/depreciation, fair value $ 1,881,741,015 $ (3,618,692,332)
Ending balance (Ounce) | oz 16,608,310 16,202,345
Ending balance, average cost $ 25,367,951,331 $ 24,106,918,759
Ending balance, fair value $ 32,255,828,173 [1] $ 27,398,975,237
[1] Cost of investment in gold bullion: $25,367,951,331 and $23,722,912,868, respectively.