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Other Stock Plans (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum amount shareholders can partake in the DRIP plan $ 100,000  
Number of shares issued under the DRIP 28,191 26,716
Shares of stock available for issuance under the DRIP Plan 362,322  
Shares available for issuance 23,000  
Restricted Stock Plan for Outside Directors | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum allowed percent of retainer fee that can be paid in common stock 100.00%  
Minimum percentage of monthly retainer fee paid in shares of common stock 40.00%  
Minimum number of shares that must be owned to avoid percentage of monthly retainer fee paid in shares of common stock 10,000  
Value of shares issued under the plan $ 241,617 $ 178,100
Number of shares forfeited during the period 0 0
Shares available for issuance 52,029  
RGC Resources, Inc. Restricted Stock Plan | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Value of shares issued under the plan $ 450,677 $ 282,365
Number of shares forfeited during the period 0 0
Shares available for issuance 413,718  
Stock Bonus Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for issuance 4,785  
Shares issued under the plan 0 0