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Cover - USD ($)
 12 Months Ended
Sep. 30, 2020
Nov. 25, 2020
Mar. 31, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2020    
Document Transition Report false    
Entity File Number 000-26591    
Entity Registrant Name RGC Resources, Inc.    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001069533    
Current Fiscal Year End Date --09-30    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 Public Float     $ 219,692,926
Entity Common Stock, Shares Outstanding   8,170,701  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE:
Portions of the RGC Resources, Inc. Proxy Statement for the 2021 Annual Meeting of Shareholders are incorporated by reference into Part III hereof.