| Document And Entity Information | Aug. 05, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | MESA LABORATORIES, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Aug. 5, 2021 |
| Entity, Incorporation, State or Country Code | CO |
| Entity, File Number | 0-11740 |
| Entity, Tax Identification Number | 84-0872291 |
| Entity, Address, Address Line One | 12100 West Sixth Avenue |
| Entity, Address, City or Town | Lakewood |
| Entity, Address, State or Province | CO |
| Entity, Address, Postal Zip Code | 80228 |
| City Area Code | 303 |
| Local Phone Number | 987-8000 |
| 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 | MLAB |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000724004 |
