Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 10,564,534	$ 8,698,412
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	8,126,427	7,600,852
Cost of retirement of utility plant, net	(544,696)	(443,586)
Stock option grants	81,380	0
Equity in earnings of unconsolidated affiliate	(4,814,874)	(3,020,348)
Allowance for funds used during construction	330,208	0
Deferred income taxes	1,122,303	684,028
Other noncash items, net	1,837,089	488,202
Changes in assets and liabilities which provided (used) cash:
Accounts receivable and customer deposits, net	53,213	(122,165)
Inventories and gas in storage	734,237	1,070,896
Regulatory and other assets	(677,488)	(156,799)
Accounts payable, customer credit balances and accrued expenses, net	659,276	(2,745,377)
Regulatory liabilities	(3,987,290)	2,643,589
Total adjustments	2,259,369	5,999,292
Net cash provided by operating activities	12,823,903	14,697,704
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for utility property	(22,916,339)	(21,884,317)
Investment in unconsolidated affiliate	(7,864,859)	(20,965,907)
Proceeds from disposal of utility property	60,187	20,219
Net cash used in investing activities	(30,721,011)	(42,830,005)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under line-of-credit	24,341,134	33,735,144
Repayments under line-of-credit	(23,370,002)	(32,923,688)
Proceeds from issuance of unsecured notes	19,463,000	56,269,000
Retirement of notes payable	0	(24,000,000)
Debt issuance expenses	(70,750)	(93,104)
Proceeds from issuance of stock	1,802,639	1,746,661
Cash dividends paid	(5,609,195)	(5,217,775)
Net cash provided by financing activities	16,556,826	29,516,238
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(1,340,282)	1,383,937
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	1,631,348	247,411
CASH AND CASH EQUIVALENTS AT END OF YEAR	291,066	1,631,348
Cash paid during the year for:
Interest	3,845,382	3,328,130
Income taxes	$ 1,673,000	$ 2,287,000