Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 30, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Document period end date Sep. 30, 2019  
Amendment flag false  
Document Period Focus Q3  
Document Fiscal Year Focus 2019  
Current fiscal year end date --12-31  
Entity central index key 0001123494  
Entity current reporting status Yes  
Entity filer category Accelerated Filer  
Entity registrant name HARVARD BIOSCIENCE INC  
Entity common stock shares outstanding   38,066,101
Entity emerging growth false  
Entity small business true  
Entity Shell Company false