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Note 6 - Line-of-credit (Details Textual) - USD ($)
Mar. 24, 2023
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Line of Credit Facility, Maximum Borrowing Capacity   $ 20,000,000   $ 13,000,000
Long-Term Line of Credit   $ 11,166,181   $ 4,353,572
Minimum [Member]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 15,000,000  
Maximum [Member]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 25,000,000  
Roanoke Gas Company [Member] | Unsecured Revolving Note Maturing March 31, 2024 [Member]        
Debt Instrument, Face Amount $ 25,000,000      
Debt Instrument, Basis Spread on Variable Rate 1.10%