Note 2 - Significant Accounting Policies - Activity in Gold Bullion (Details)		12 Months Ended
		Dec. 31, 2022 USD ($) oz		Dec. 31, 2021 USD ($) oz
Beginning balance (Ounce) | oz		479,334		5,000
Beginning balance, average cost		$ 858,638,067		$ 9,325,500
Beginning balance, fair value		$ 872,434,117	[1]	$ 9,325,500
Gold bullion contributed (Ounce) | oz		312,815		494,428
Gold bullion contributed, average cost		$ 568,682,673		$ 885,306,489
Gold bullion contributed, fair value		$ 568,682,673		$ 885,306,489
Gold bullion distributed (Ounce) | oz		(169,380)		(19,992)
Gold bullion distributed, average cost		$ (305,827,276)		$ (35,810,420)
Gold bullion distributed, fair value		(315,644,715)		(35,912,133)
Gold bullion distributed, realized gain (loss)		$ 9,817,439		$ 101,713
Gold bullion sold to pay expenses (Ounce) | oz		(422)		(102)
Gold bullion sold to pay expenses, average cost		$ (761,354)		$ (183,502)
Gold bullion sold to pay expenses, fair value		(758,873)		(183,110)
Gold bullion sold to pay expenses, realized gain (loss)		(2,481)		(392)
Net realized gain (loss), fair value		9,814,958		101,321
Net change in unrealized appreciation/depreciation, fair value		$ (6,619,441)		$ 13,796,050
Ending balance (Ounce) | oz		622,347		479,334
Ending balance, average cost		$ 1,120,732,110		$ 858,638,067
Ending balance, fair value	[1]	1,127,908,719		872,434,117
Ending balance, realized gain (loss)		$ 9,814,958		$ 101,321

[1] Cost of investment in gold bullion: $1,120,732,110 and $858,638,067, respectively.