Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
OPERATING REVENUES:
Operating revenues	$ 11,071,918	$ 11,682,950	$ 53,295,102	$ 58,174,656
OPERATING EXPENSES:
Operations and maintenance	3,426,231	3,426,717	11,453,850	10,662,800
General taxes	527,418	494,958	1,658,528	1,559,183
Depreciation and amortization	1,988,505	1,905,475	5,965,226	5,716,425
Total operating expenses	9,736,255	10,045,893	39,877,844	47,069,894
OPERATING INCOME	1,335,663	1,637,057	13,417,258	11,104,762
Equity in earnings of unconsolidated affiliate	1,205,574	777,193	3,488,253	2,038,417
Other income (expense), net	52,556	(5,967)	528,091	241,628
Interest expense	986,203	925,698	3,109,681	2,635,129
INCOME BEFORE INCOME TAXES	1,607,590	1,482,585	14,323,921	10,749,678
INCOME TAX EXPENSE	401,012	344,030	3,430,091	2,506,871
NET INCOME	$ 1,206,578	$ 1,138,555	$ 10,893,830	$ 8,242,807
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.15	$ 0.14	$ 1.34	$ 1.03
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	0.15	0.14	1.34	1.02
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.175	$ 0.165	$ 0.525	$ 0.495
Gas Utility [Member]
OPERATING REVENUES:
Operating revenues	$ 10,856,453	$ 11,534,948	$ 52,757,778	$ 57,630,278
OPERATING EXPENSES:
Cost of gas and sales	3,680,408	4,132,871	20,531,211	28,810,668
Non Utility [Member]
OPERATING REVENUES:
Operating revenues	215,465	148,002	537,324	544,378
OPERATING EXPENSES:
Cost of gas and sales	$ 113,693	$ 85,872	$ 269,029	$ 320,818