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Note 7 - Commitments and Contingent Liabilities (Details Textual) - USD ($)
$ in Millions
3 Months Ended 172 Months Ended
Apr. 30, 2023
Apr. 30, 2023
Great Notch Condominium Claims[Member]    
Loss Contingency, Damages Sought, Value $ 119.5  
Spill Fund Lawsuit [Member]    
Loss Contingency, Damages Sought, Value   $ 5.3