| Cover | Oct. 07, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 7, 2021 |
| Entity Registrant Name | Riley Exploration Permian, Inc. |
| Entity Incorporation, Date of Incorporation | DE |
| Entity File Number | 1-15555 |
| Entity Tax Identification Number | 87-0267438 |
| Entity Address, Address Line One | 29 E. Reno Avenue |
| Entity Address, Address Line Two | Suite 500 |
| Entity Address, City or Town | Oklahoma City |
| Entity Address, State or Province | OK |
| Entity Address, Postal Zip Code | 73104 |
| City Area Code | 405 |
| Local Phone Number | 415-8699 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | REPX |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001001614 |
| Amendment Flag | false |
