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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:              
Net income $ 7,676,208 $ 5,269,689 $ 6,443,390 $ 5,019,992 $ 12,945,897 $ 11,463,382  
Adjustments to reconcile net income to net cash provided by operating activities:              
Depreciation and amortization         5,700,128 5,523,841  
Cost of retirement of utility property         (252,304) (292,647)  
Stock-based compensation         447,589 470,118  
Equity in earnings of unconsolidated affiliate (801,175)   (1,229,384)   (1,655,388) (2,697,219)  
Distributions from unconsolidated affiliate         1,784,582 0  
Changes in assets and liabilities which provided cash, exclusive of changes and noncash transactions shown separately         2,864,459 (3,265,473)  
Net cash provided by operating activities         21,834,963 11,202,002  
CASH FLOWS FROM INVESTING ACTIVITIES:              
Additions to utility property         (10,692,338) (11,279,097) $ (22,094,406)
Investment in unconsolidated affiliates         (35,164) (3,381) (18,258)
Proceeds from disposal of utility property         18,696 1,730  
Net cash used in investing activities         (10,708,806) (11,280,748)  
CASH FLOWS FROM FINANCING ACTIVITIES:              
Proceeds from issuance of unsecured notes         1,225,000 275,000  
Repayments of notes payable         (1,080,000) (1,050,000)  
Borrowings under line-of-credit         26,329,645 25,862,523  
Repayments under line-of-credit         (33,331,560) (23,633,915)  
Debt issuance expenses         (2,000) (33,268)  
Proceeds from issuance of stock         (1,178,250) (3,176,237)  
Cash dividends paid         (4,186,906) (4,011,079)  
Net cash (used in) provided by financing activities         (9,867,571) 585,498  
NET INCREASE IN CASH AND CASH EQUIVALENTS         1,258,586 506,752  
BEGINNING CASH AND CASH EQUIVALENTS   $ 894,185   $ 1,512,431 894,185 1,512,431 1,512,431
ENDING CASH AND CASH EQUIVALENTS $ 2,152,771   $ 2,019,183   2,152,771 2,019,183 $ 894,185
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:              
Interest         3,301,190 3,101,956  
Income taxes         $ 2,175,000 $ (125,000)