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Consolidated Statements of Income - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Revenues $ 95,334,212 $ 84,641,232
OPERATING EXPENSES:    
Operations and maintenance 19,911,410 18,354,736
Taxes other than income taxes 2,933,787 2,694,652
Depreciation and amortization 11,470,641 10,518,094
Total operating expenses 76,886,711 67,559,472
OPERATING INCOME 18,447,501 17,081,760
Equity in earnings of unconsolidated affiliate 3,234,632 3,851,871
Other income, net 2,232,883 1,028,761
Interest expense 6,543,511 6,504,885
INCOME BEFORE INCOME TAXES 17,371,505 15,457,507
INCOME TAX EXPENSE 4,091,535 3,696,611
NET INCOME $ 13,279,970 $ 11,760,896
EARNINGS PER COMMON SHARE:    
Basic (in dollars per share) $ 1.29 $ 1.16
Diluted (in dollars per share) $ 1.29 $ 1.16
WEIGHTED AVERAGE SHARES OUTSTANDING:    
Basic (in shares) 10,304,109 10,152,909
Diluted (in shares) 10,308,686 10,156,480
Gas Utility [Member]    
Revenues $ 95,231,943 $ 84,533,101
OPERATING EXPENSES:    
Cost of gas and sale 42,550,954 35,967,987
Non-utility [Member]    
Revenues 102,269 108,131
OPERATING EXPENSES:    
Cost of gas and sale $ 19,919 $ 24,003