| Document And Entity Information | Nov. 14, 2022 |
| Document Information [Line Items] | |
| Entity, Registrant Name | RGC RESOURCES, INC. |
| Document, Type | 8-K/A |
| Document, Period End Date | Nov. 14, 2022 |
| 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., 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | RGCO |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Description | 2022.11.14 MVP Impairment Determination |
| Amendment Flag | true |
| Entity, Central Index Key | 0001069533 |
