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Cover - shares
9 Months Ended
Jun. 30, 2020
Jul. 31, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Period End Date Jun. 30, 2020  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 000-26591  
Entity Registrant Name RGC Resources, Inc.  
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   8,149,985
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001069533  
Current Fiscal Year End Date --09-30