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Document and Entity Information Document
 9 Months Ended
Sep. 30, 2014
Oct. 15, 2014
Entity Information    
Entity Registrant Name Tennant Company  
Entity Central Index Key 0000097134  
Document Type 10-Q  
Document Period End Date Sep. 30, 2014  
Current Fiscal Year End Date --12-31  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   18,400,228
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q3  
Amendment Flag false