| Document And Entity Information | Sep. 26, 2024 |
| Document Information [Line Items] | |
| Entity, Registrant Name | GENPREX, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Sep. 26, 2024 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 001-38244 |
| Entity, Tax Identification Number | 90-0772347 |
| Entity, Address, Address Line One | 3300 Bee Cave Road |
| Entity, Address, Address Line Two | #650-227 |
| Entity, Address, City or Town | Austin |
| Entity, Address, State or Province | TX |
| Entity, Address, Postal Zip Code | 78746 |
| City Area Code | 512 |
| Local Phone Number | 537-7997 |
| 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 | GNPX |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001595248 |
