| Document And Entity Information | Mar. 06, 2024 |
| Document Information [Line Items] | |
| Entity, Registrant Name | inTEST Corporation |
| Document, Type | 8-K/A |
| Document, Period End Date | Mar. 06, 2024 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 1-36117 |
| Entity, Tax Identification Number | 22-2370659 |
| Entity, Address, Address Line One | 804 East Gate Drive, Suite 200 |
| Entity, Address, City or Town | Mt. Laurel |
| Entity, Address, State or Province | NJ |
| Entity, Address, Postal Zip Code | 08054 |
| City Area Code | 856 |
| Local Phone Number | 505-8800 |
| 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 | INTT |
| Security Exchange Name | NYSE |
| Entity, Emerging Growth Company | false |
| Amendment Description | Form 8-K/A No. 1 date of report 03-06-24 |
| Amendment Flag | true |
| Entity, Central Index Key | 0001036262 |
