Document and Entity Information
| Document and Entity Information | Mar. 23, 2022 |
| Cover [Abstract] | |
| Document, Type | 8-K/A |
| Amendment Flag | true |
| Document, Period End Date | Mar. 23, 2022 |
| Entity, Registrant Name | RGC Resources, Inc. |
| Entity, Incorporation, State or Country Code | VA |
| Entity, File Number | 000-26591 |
| Entity, Tax Identification Number | 54-1909697 |
| Entity, Address, Address Line One | 519 Kimball Ave. |
| Entity, Address, City or Town | N.E. Roanoke |
| Entity, Address, State or Province | VA |
| Entity, Address, Postal Zip Code | 24016 |
| City Area Code | 540 |
| Local Phone Number | 777-4427 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $5 Par Value |
| Trading Symbol | RGCO |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Description | This Amendment No. 1 to Form 8-K is being filed to provide additional information with respect to the evaluation of a potential material impairment initially disclosed under Item 2.06 in the Form 8-K filed by the registrant on February 22, 2022. |
| Entity, Central Index Key | 0001069533 |