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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 ($)
Jun. 30, 2024
Sep. 30, 2023
Total Assets fair value $ 3,236,627 $ 4,617,455
Natural gas purchases 1,955,937 1,022,662
Total Liabilities fair value 1,955,937 1,022,662
Fair Value, Inputs, Level 1 [Member]    
Total Assets fair value 0 0
Natural gas purchases 0 0
Total Liabilities fair value 0 0
Interest rate swaps, liabilities   0
Fair Value, Inputs, Level 2 [Member]    
Total Assets fair value 3,236,627 4,617,455
Natural gas purchases 1,955,937 1,022,662
Total Liabilities fair value 1,955,937 1,022,662
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 3,236,627  
Interest rate swaps, liabilities   4,617,455
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Interest rate swaps 0  
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Interest rate swaps 3,236,627  
Interest rate swaps, liabilities   4,617,455
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Interest rate swaps $ 0  
Interest rate swaps, liabilities   $ 0