v3.8.0.1
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2016
Mar. 17, 2017
Jun. 30, 2016
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)   10,402,058  
Entity Public Float     $ 31,138,682
Document Type 8-K    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag false