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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,584,529 $ 4,723,263
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,329,409 2,215,525
Cost of retirement of utility plant, net (113,505) (138,954)
Stock option grants 5,550 0
Equity in earnings of unconsolidated affiliate (72,127) (1,356,683)
Allowance for funds used during construction 0 (55,980)
Changes in assets and liabilities which used cash, exclusive of changes and noncash transactions shown separately (9,278,622) (5,234,261)
Net cash provided by (used in) operating activites (3,544,766) 152,910
CASH FLOWS FROM INVESTING ACTIVITIES:    
Expenditures for utility property (5,737,232) (5,332,997)
Investment in unconsolidated affiliates (2,143,981) (2,522,286)
Proceeds from disposal of utility property 48,300 1,972
Net cash used in investing activities (7,832,913) (7,853,311)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of unsecured notes 25,930,000 2,905,000
Retirement of notes payable (15,000,000) 0
Borrowings under line-of-credit 24,123,902 10,617,491
Repayments under line-of-credit (22,147,391) (4,222,606)
Debt issuance expenses (39,732) 0
Proceeds from issuance of stock (294,297) (274,382)
Cash dividends paid (1,549,840) (1,428,267)
Net cash provided by financing activities 11,611,236 8,146,000
NET INCREASE IN CASH AND CASH EQUIVALENTS 233,557 445,599
BEGINNING CASH AND CASH EQUIVALENTS 1,518,317 291,066
ENDING CASH AND CASH EQUIVALENTS $ 1,751,874 $ 736,665