Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information - shares
9 Months Ended
Sep. 27, 2020
Nov. 05, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Central Index Key 0001108320  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 27, 2020  
Document Fiscal Year Focus 2020  
Current Fiscal Year End Date --12-27  
Entity File Number 000-31051  
Entity Registrant Name SMTC CORPORATION  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 98-0197680  
Entity Address, Address Line One 7050 WOODBINE AVENUE  
Entity Address, State or Province ON  
Entity Address, City or Town MARKHAM  
Entity Address, Country CA  
Entity Address, Postal Zip Code L3R 4G8  
City Area Code 905  
Local Phone Number 479-1810  
Title of 12(b) Security Common Stock  
Trading Symbol SMTX  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   28,214,800