Document And Entity Information - shares	6 Months Ended
	Mar. 31, 2022	Apr. 30, 2022
Document Information [Line Items]
Entity Central Index Key	0001069533
Entity Registrant Name	RGC Resources, Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	000-26591
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	54-1909697
Entity Address, Address Line One	519 Kimball Ave., N.E.
Entity Address, City or Town	Roanoke
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	24016
City Area Code	540
Local Phone Number	777-4427
Title of 12(b) Security	Common Stock, $5 Par Value
Trading Symbol	RGCO
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		9,791,422