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Note 7 - Commitments and Contingent Liabilities (Details Textual)
$ in Millions
6 Months Ended
Apr. 30, 2024
USD ($)
Great Notch Condominium Claims[Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Damages Sought, Value $ 119.5
Spill Fund Lawsuit [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Damages Sought, Value $ 5.3