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Note 2 - Significant Accounting Policies - Gold Receivable and Payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Sep. 30, 2022
Gold receivable $ 0 $ 0
Gold payable 0 52,777
SPDR Gold Mini Shares Trust [Member]    
Gold receivable 0 0
Gold payable $ 0 $ 52,777