| Document And Entity Information | Mar. 15, 2022 |
| Document Information [Line Items] | |
| Entity, Registrant Name | GB Sciences, Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Mar. 15, 2022 |
| Entity, Incorporation, State or Country Code | NV |
| Entity, File Number | 000-55462 |
| Entity, Tax Identification Number | 59-3733133 |
| Entity, Address, Address Line One | 3550 W. Teco Avenue |
| Entity, Address, City or Town | Las Vegas |
| Entity, Address, State or Province | NV |
| Entity, Address, Postal Zip Code | 89118 |
| City Area Code | (866) |
| Local Phone Number | 721-0297 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001165320 |
