| Document And Entity Information | Oct. 26, 2020 |
| Document Information [Line Items] | |
| Entity, Registrant Name | PetMed Express, Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Oct. 26, 2020 |
| Entity, Incorporation, State or Country Code | FL |
| Entity, File Number | 000-28827 |
| Entity, Tax Identification Number | 65-0680967 |
| Entity, Address, Address Line One | 420 South Congress Avenue |
| Entity, Address, City or Town | Delray Beach |
| Entity, Address, State or Province | FL |
| Entity, Address, Postal Zip Code | 33445 |
| City Area Code | 561 |
| Local Phone Number | 526-4444 |
| 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 | PETS |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001040130 |
