XML 52 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document and Entity Information - shares
6 Months Ended
Mar. 31, 2020
Apr. 30, 2020
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Entity Registrant Name RGC RESOURCES INC  
Entity Central Index Key 0001069533  
Current Fiscal Year End Date --09-30  
Entity Current Reporting Status 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   8,138,246