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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 13,279,970 $ 11,760,896
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization 11,470,641 10,518,094
Cost of retirement of utility property (512,872) (576,771)
Stock-based compensation 673,057 711,924
Equity in earnings of unconsolidated affiliate (3,234,632) (3,851,871)
Distributions from unconsolidated affiliate 3,644,542 0
Donated property (762,240) (781,990)
Deferred income taxes 318,673 (121,781)
Other noncash items, net 371,170 516,836
Changes in assets and liabilities which provided (used) cash:    
Accounts receivable and customer deposits, net (293,609) (275,196)
Inventories and gas in storage 175,219 2,568,942
Regulatory and other assets 2,935,963 (2,765,027)
Regulatory liabilities (405,105) (1,006,472)
Other 1,287,372 736,041
Net cash provided by operating activities 28,948,149 17,433,625
CASH FLOWS FROM INVESTING ACTIVITIES:    
Additions to utility property (20,730,140) (22,094,406)
Investment in unconsolidated affiliates (76,385) (18,258)
Proceeds from disposal of utility property 72,910 79,032
Net cash used in investing activities (20,733,615) (22,033,632)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under line-of-credit 48,597,639 45,388,194
Repayments under line-of-credit (47,847,060) (38,575,585)
Proceeds from issuance of unsecured notes 17,529,215 10,855,000
Retirement of notes payable (18,180,000) (10,175,000)
Debt issuance expenses (184,300) (101,206)
Proceeds from issuance of stock (1,765,261) (4,679,209)
Cash dividends paid (8,469,105) (8,088,851)
Net cash provided by (used in) financing activities (6,788,350) 3,981,761
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,426,184 (618,246)
BEGINNING CASH AND CASH EQUIVALENTS 894,185 1,512,431
ENDING CASH AND CASH EQUIVALENTS 2,320,369 894,185
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest 6,350,032 6,273,144
Income taxes 4,195,000 2,940,000
Significant noncash activities:    
Accrued capital expenditures 1,378,196 1,257,734
Proceeds and retirement of borrowings with the same financial institution $ 38,600,000 $ 0