v3.26.1
Note 9 - Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
Jun. 30, 2026
Sep. 30, 2025
Interest rate swaps $ 550,336 $ 828,573
Interest rate swaps 823,192 421,511
Interest Rate Swap [Member]    
Interest rate swaps - current 35,735 57,144
Interest rate swaps - noncurrent 77,427 298,016
Fair Value, Recurring [Member]    
Total Assets fair value 1,373,528 1,250,084
Natural gas purchases 893,886 135,863
Total Liabilities fair value 1,007,048 491,023
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Total Assets fair value 0 0
Natural gas purchases 0 0
Total Liabilities fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total Assets fair value 1,373,528 1,250,084
Natural gas purchases 893,886 135,863
Total Liabilities fair value 1,007,048 491,023
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Total Assets fair value 0 0
Natural gas purchases 0 0
Total Liabilities fair value 0 0
Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Interest rate swaps 550,336 828,573
Interest rate swaps 823,192 421,511
Interest rate swaps - current 35,735 57,144
Interest rate swaps - noncurrent 77,427 298,016
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Interest rate swaps 0 0
Interest rate swaps 0 0
Interest rate swaps - current 0
Interest rate swaps - noncurrent 0
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Interest rate swaps 550,336 828,573
Interest rate swaps 823,192 421,511
Interest rate swaps - current 35,735 57,144
Interest rate swaps - noncurrent 77,427 298,016
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Interest rate swaps 0 0
Interest rate swaps 0 0
Interest rate swaps - current 0 0
Interest rate swaps - noncurrent $ 0 $ 0