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Note 7 - Commitments and Contingent Liabilities (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 175 Months Ended
Jul. 31, 2023
Jul. 31, 2023
Jul. 31, 2023
Great Notch Condominium Claims[Member]      
Loss Contingency, Damages Sought, Value $ 119.5 $ 119.5  
Spill Fund Lawsuit [Member]      
Loss Contingency, Damages Sought, Value     $ 5.3