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Cover - USD ($)
 12 Months Ended
Dec. 31, 2020
Jan. 31, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Entity File Number 0-10546    
Entity Registrant Name LAWSON PRODUCTS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-2229304    
Entity Address, Address Line One 8770 W. Bryn Mawr Avenue    
Entity Address, Address Line Two Suite 900    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60631    
City Area Code 773    
Local Phone Number 304-5050    
Title of 12(b) Security Common Stock, $1.00 par value    
Trading Symbol LAWS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 141,259,000
Entity Common Stock, Shares Outstanding   9,061,039  
Documents Incorporated by Reference
The following documents are incorporated into this Form 10-K by reference:
Part III incorporates information by reference to the registrant’s definitive proxy statement, to be filed with the Securities and Exchange Commission within 120 days after the close of the fiscal year.
    
Entity Central Index Key 0000703604    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY