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(Loss) Earnings Attributable to Tennant Company Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net (Loss) Earnings Attributable to Tennant Company $ (2,591) $ 15,328 $ (6,548) $ 19,767
Denominator:        
Basic - Weighted Average Shares Outstanding 17,693,102 17,508,022 17,645,090 17,526,107
Effect of dilutive securities:        
Share-based compensation plans 0 425,221 0 428,060
Diluted - Weighted Average Shares Outstanding 17,693,102 17,933,243 17,645,090 17,954,167
Basic (Loss) Earnings per Share $ (0.15) $ 0.88 $ (0.37) $ 1.13
Diluted (Loss) Earnings per Share $ (0.15) $ 0.85 $ (0.37) $ 1.10
Anti-dilutive securities excluded from earnings per share calculation 735,377 408,979 716,401 405,123