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Document and Entity Information Document
 3 Months Ended
Mar. 31, 2015
Apr. 15, 2015
Entity Information    
Entity Registrant Name Tennant Company  
Entity Central Index Key 0000097134  
Document Type 10-Q  
Document Period End Date Mar. 31, 2015  
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 Common Stock, Shares Outstanding   18,402,023dei_EntityCommonStockSharesOutstanding
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Amendment Flag false