Document and Entity Information - shares
9 Months Ended
Sep. 30, 2018
Nov. 06, 2018
Document and Entity Information    
Entity Registrant Name DOUGLAS DYNAMICS, INC  
Entity Central Index Key 0001287213  
Document Type 10-Q  
Document Period End Date Sep. 30, 2018  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   22,700,991
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3