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Note 6 - Line-of-credit (Details Textual) - USD ($)
Mar. 24, 2023
Sep. 30, 2023
Sep. 30, 2022
Line of Credit Facility, Maximum Borrowing Capacity   $ 13,000,000 $ 28,000,000
Long-Term Line of Credit   $ 4,353,572 $ 0
Minimum [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000,000    
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%