Segment Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 11,071,918	$ 11,682,950	$ 53,295,102	$ 58,174,656
Depreciation	1,988,505	1,905,475	5,965,226	5,716,425
Operating income (loss)	1,335,663	1,637,057	13,417,258	11,104,762
Equity in earnings	1,205,574	777,193	3,488,253	2,038,417
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
Total assets	273,340,758		273,340,758		$ 258,353,696
Operating Segments [Member] | Gas Utility [Member]
Segment Reporting Information [Line Items]
Operating revenues	10,856,453	11,534,948	52,757,778	57,630,278
Depreciation	1,988,505	1,905,475	5,965,226	5,716,425
Operating income (loss)	1,291,678	1,629,681	13,321,691	11,014,558
Equity in earnings	0	0	0	0
Interest expense	667,702	604,863	2,048,552	1,766,611
Income before income taxes	674,351	1,016,963	11,795,644	9,485,089
Total assets	204,124,191		204,124,191		195,969,019
Operating Segments [Member] | Investment In Affiliates [Member]
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Depreciation	0	0	0	0
Operating income (loss)	(55,097)	(51,896)	(163,214)	(125,177)
Equity in earnings	1,205,574	777,193	3,488,253	2,038,417
Interest expense	318,501	320,835	1,061,129	868,518
Income before income taxes	834,054	406,246	2,269,106	1,048,922
Total assets	55,393,022		55,393,022		47,429,368
Parent and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	215,465	148,002	537,324	544,378
Depreciation	0	0	0	0
Operating income (loss)	99,082	59,272	258,781	215,381
Equity in earnings	0	0	0	0
Interest expense	0	0	0	0
Income before income taxes	99,185	$ 59,376	259,171	$ 215,667
Total assets	$ 13,823,545		$ 13,823,545		$ 14,955,309