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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 5,269,689 $ 5,019,992  
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 2,843,360 2,761,920  
Cost of retirement of utility property (109,895) (136,639)  
Stock-based compensation 116,613 43,157  
Equity in earnings of unconsolidated affiliate (854,213) (1,467,835)  
Distributions from unconsolidated affiliate 801,816 0  
Changes in assets and liabilities which provided cash, exclusive of changes and noncash transactions shown separately (7,240,180) (6,784,942)  
Net cash provided by (used in) operating activities 827,190 (564,347)  
CASH FLOWS FROM INVESTING ACTIVITIES:      
Additions to utility property (5,748,177) (5,300,669) $ (22,094,406)
Investment in unconsolidated affiliates (17,738) 0 (18,258)
Proceeds from disposal of utility property 14,452 374  
Net cash used in investing activities (5,751,463) (5,300,295)  
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from issuance of unsecured notes 420,000 0  
Repayments of notes payable (380,000) (525,000)  
Borrowings under line-of-credit 14,486,406 16,390,292  
Repayments under line-of-credit (6,616,486) (7,491,268)  
Proceeds from issuance of stock (268,817) (821,324)  
Cash dividends paid (2,050,286) (1,978,400)  
Net cash provided by financing activities 6,128,451 7,216,948  
NET INCREASE IN CASH AND CASH EQUIVALENTS 1,204,178 1,352,306  
BEGINNING CASH AND CASH EQUIVALENTS 894,185 1,512,431 1,512,431
ENDING CASH AND CASH EQUIVALENTS 2,098,363 2,864,737 $ 894,185
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest 2,024,114 1,881,273  
Income taxes $ 0 $ (1,000,000)