| Document And Entity Information | Jan. 03, 2022 |
| Document Information [Line Items] | |
| Entity, Registrant Name | PERMA-PIPE INTERNATIONAL HOLDINGS, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Jan. 3, 2022 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 001-32530 |
| Entity, Tax Identification Number | 36-3922969 |
| Entity, Address, Address Line One | 6410 West Howard Street |
| Entity, Address, City or Town | Niles |
| Entity, Address, State or Province | IL |
| Entity, Address, Postal Zip Code | 60714 |
| City Area Code | 847 |
| Local Phone Number | 966-1000 |
| 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 | PPIH |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000914122 |
