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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 07, 2022
Jun. 30, 2021
Document Information [Line Items]      
Entity Central Index Key 0001123494    
Entity Registrant Name HARVARD BIOSCIENCE INC    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-33957    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 04-3306140    
Entity Address, Address Line One 84 October Hill Road    
Entity Address, City or Town Holliston    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01746    
City Area Code 508    
Local Phone Number 893-8999    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol HBIO    
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    
Entity Shell Company false    
Entity Public Float     $ 324,400,000
Entity Common Stock, Shares Outstanding   41,230,462  
Auditor Name GRANT THORNTON LLP    
Auditor Location Boston, Massachusetts    
Auditor Firm ID 248    
ICFR Auditor Attestation Flag true