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Note 11 - Concentrations of Credit Risk (Details Textual) Pure in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2023 USD ($)
Customer Concentration Risk [Member] | Utility Companies and Their Marketing Affiliates [Member] |
Accounts Receivable, after Allowance for Credit Loss | $ 53.4
Customer Concentration Risk [Member] | Five Largest Counterparties [Member] |
Accounts Receivable, after Allowance for Credit Loss | $ 26.7
Gas Utility [Member] |
Number of Customer Serves | 1.7

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