Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Feb. 23, 2021
Jun. 30, 2020
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2020    
Entity File Number 001-34728    
Entity Registrant Name DOUGLAS DYNAMICS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-4275891    
Entity Address, Address Line One 7777 N 73rd Street    
Entity Address, City or Town Milwaukee    
Entity Address, Postal Zip Code 53223    
Entity Address, State or Province WI    
City Area Code 414    
Local Phone Number 354-2310    
Title of 12(b) Security Common Stock, par value $.01 per share    
Trading Symbol PLOW    
Security Exchange Name NYSE    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Icfr Auditor Attestation Flag true    
Entity Common Stock, Shares Outstanding   22,857,457  
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001287213    
Amendment Flag false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Public Float     $ 803