v3.10.0.1
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Feb. 26, 2019
Jun. 29, 2018
Document and Entity Information      
Entity Registrant Name DOUGLAS DYNAMICS, INC    
Entity Central Index Key 0001287213    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1,090
Entity Common Stock, Shares Outstanding   22,700,991  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY