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Note 11 - Concentrations of Credit Risk (Details Textual)
Pure in Millions, $ in Millions
12 Months Ended
Sep. 30, 2024
USD ($)
Customer Concentration Risk [Member] | Utility Companies and Their Marketing Affiliates [Member]  
Accounts Receivable, after Allowance for Credit Loss $ 45.9
Customer Concentration Risk [Member] | Five Largest Counterparties [Member]  
Accounts Receivable, after Allowance for Credit Loss $ 21.0
Gas Utility [Member]  
Number of Customer Serves 1.7