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Note 2 - Significant Accounting Policies - Summary of Investments at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Sep. 30, 2022
Investments, fair value $ 6,088,852 $ 4,692,387
SPDR Gold Mini Shares Trust [Member]    
Investments, fair value 6,088,852 4,692,387
Fair Value, Inputs, Level 1 [Member]    
Investments, fair value 6,088,852 4,692,387
Fair Value, Inputs, Level 1 [Member] | SPDR Gold Mini Shares Trust [Member]    
Investments, fair value 6,088,852 4,692,387
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 6,088,852 4,692,387
Investment in Gold [Member] | Fair Value, Inputs, Level 1 [Member] | SPDR Gold Mini Shares Trust [Member]    
Investments, fair value 6,088,852 4,692,387
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