v3.10.0.1
Document And Entity Information - shares
6 Months Ended
Jun. 30, 2018
Jul. 31, 2018
Document Information [Line Items]    
Entity Registrant Name INTEST CORP  
Entity Central Index Key 0001036262  
Trading Symbol intt  
Current Fiscal Year End Date --12-31  
Entity Filer Category Smaller Reporting Company  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   10,489,958
Document Type 10-Q  
Document Period End Date Jun. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Amendment Flag false