v3.4.0.3
Document And Entity Information - shares
3 Months Ended
Mar. 26, 2016
Apr. 11, 2016
Entity Registrant Name COHU INC  
Entity Central Index Key 0000021535  
Trading Symbol cohu  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   26,588,665
Document Type 10-Q  
Document Period End Date Mar. 26, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Amendment Flag false