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Note 9 - Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
Dec. 31, 2024
Sep. 30, 2024
Total Assets fair value $ 2,372,456 $ 2,062,551
Natural gas purchases 2,189,764 761,020
Total Liabilities fair value 2,189,764 761,020
Fair Value, Inputs, Level 1 [Member]    
Interest rate swaps, assets   0
Total Assets fair value 0 0
Natural gas purchases 0 0
Total Liabilities fair value 0 0
Fair Value, Inputs, Level 2 [Member]    
Total Assets fair value 2,372,456 2,062,551
Natural gas purchases 2,189,764 761,020
Total Liabilities fair value 2,189,764 761,020
Fair Value, Inputs, Level 3 [Member]    
Total Assets fair value 0 0
Natural gas purchases 0 0
Total Liabilities fair value 0 0
Interest Rate Swap [Member]    
Interest rate swaps, assets 2,372,456 2,062,551
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Interest rate swaps, assets 0  
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Interest rate swaps, assets 2,372,456 2,062,551
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Interest rate swaps, assets $ 0 $ 0