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Note 6 - Line of Credit (Details Textual) - USD ($)
Mar. 24, 2023
Dec. 31, 2024
Mar. 31, 2024
Long-Term Line of Credit   $ 19,036,101  
Minimum [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 15,000,000
Long-Term Line of Credit   $ 10,000,000  
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%