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Note 2 - Significant Accounting Policies - Summary of Investments at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Fair Value, Inputs, Level 1 [Member]    
Investments, fair value $ 9,185,355 $ 9,161,023
Fair Value, Inputs, Level 1 [Member] | SPDR Gold Mini Shares Trust [Member]    
Investments, fair value 9,185,355 9,161,023
Fair Value, Inputs, Level 2 [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 2 [Member] | SPDR Gold Mini Shares Trust [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 3 [Member]    
Investments, fair value 0 0
Fair Value, Inputs, Level 3 [Member] | SPDR Gold Mini Shares Trust [Member]    
Investments, fair value 0 0
Investment in Gold [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments, fair value 9,185,355 9,161,023
Investment in Gold [Member] | Fair Value, Inputs, Level 1 [Member] | SPDR Gold Mini Shares Trust [Member]    
Investments, fair value 9,185,355 9,161,023
Investment in Gold [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments, fair value 0 0
Investment in Gold [Member] | Fair Value, Inputs, Level 2 [Member] | SPDR Gold Mini Shares Trust [Member]    
Investments, fair value 0 0
Investment in Gold [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments, fair value 0 0
Investment in Gold [Member] | Fair Value, Inputs, Level 3 [Member] | SPDR Gold Mini Shares Trust [Member]    
Investments, fair value $ 0 $ 0