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Consolidated Balance Sheets - USD ($)
Sep. 30, 2025
Sep. 30, 2024
CURRENT ASSETS:    
Cash and cash equivalents $ 2,320,369 $ 894,185
Accounts receivable, net 4,836,982 4,483,739
Inventories 2,018,316 1,799,631
Gas in storage 8,097,586 8,491,490
Prepaid income taxes 1,618,560 2,362,069
Regulatory assets 2,582,838 5,103,910
Interest rate swaps 828,573 871,026
Other 1,015,967 1,066,251
Total current assets 23,319,191 25,072,301
UTILITY PROPERTY:    
In service 366,843,353 345,864,008
Accumulated depreciation and amortization (100,131,084) (92,462,376)
In service, net 266,712,269 253,401,632
Construction work in progress 8,201,314 8,639,822
Utility property, net 274,913,583 262,041,454
OTHER NON-CURRENT ASSETS:    
Regulatory assets 3,315,082 4,445,044
Investment in unconsolidated affiliates 20,723,697 21,057,222
Benefit plan assets 5,935,885 5,416,536
Deferred Income Tax Assets, Net 617,390 771,746
Interest rate swaps 421,511 1,191,526
Other 593,227 703,394
Total other non-current assets 31,606,792 33,585,468
TOTAL ASSETS 329,839,566 320,699,223
Liabilities, Current [Abstract]    
Current maturities of long-term debt 2,846,018 800,000
Line-of-credit 0 11,166,181
Dividends payable 2,145,558 2,050,286
Accounts payable 7,085,817 5,429,703
Customer credit balances 1,891,161 1,915,859
Customer deposits 1,537,311 1,488,113
Accrued expenses 5,312,204 4,988,281
Regulatory liabilities 1,638,911 834,278
Other 25,600 25,729
Total current liabilities 22,539,724 28,698,430
LONG-TERM DEBT:    
Notes payable 134,258,197 136,955,000
Line-of-credit 11,916,760 0
Unamortized debt issuance costs (405,794) (282,092)
Long-term debt, net 145,769,163 136,672,908
DEFERRED CREDITS AND OTHER NON-CURRENT LIABILITIES:    
Asset retirement obligations 11,640,435 11,142,095
Regulatory cost of retirement obligations 15,869,691 14,409,847
Benefit plan liabilities 201,194 113,600
Deferred Income Tax Liabilities, Net 2,277,550 1,890,562
Regulatory liabilities 17,371,430 19,326,567
Other 319,573 308,439
Total deferred credits and other non-current liabilities 47,977,889 47,191,110
COMMITMENTS AND CONTINGENCIES (Note 14)
STOCKHOLDERS' EQUITY:    
Common stock, $5 par value; authorized 20,000,000 shares; issued and outstanding 10,338,308 and 10,249,899 shares in 2025 and 2024, respectively 51,691,540 51,249,495
Preferred stock, no par; authorized 5,000,000 shares; no shares issued and outstanding in 2025 and 2024 0 0
Capital in excess of par value 49,311,486 47,988,270
Retained earnings 12,288,032 7,572,439
Accumulated other comprehensive income 261,732 1,326,571
Total stockholders’ equity 113,552,790 108,136,775
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY 329,839,566 320,699,223
Interest Rate Swap [Member]    
Liabilities, Current [Abstract]    
Interest rate swaps 57,144 0
DEFERRED CREDITS AND OTHER NON-CURRENT LIABILITIES:    
Interest rate swaps $ 298,016 $ 0