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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Share
The computations of Basic and Diluted (Loss) Earnings Attributable to Tennant Company per Share for the years ended December 31 were as follows:
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net (Loss) Earnings Attributable to Tennant Company
$
(6,195
)
 
$
46,614

 
$
32,088

Denominator:
 

 
 

 
 

Basic - Weighted Average Shares Outstanding
17,695,390

 
17,523,267

 
18,015,151

Effect of dilutive securities
—

 
452,916

 
478,296

Diluted - Weighted Average Shares Outstanding
17,695,390

 
17,976,183

 
18,493,447

Basic (Loss) Earnings per Share
$
(0.35
)
 
$
2.66

 
$
1.78

Diluted (Loss) Earnings per Share
$
(0.35
)
 
$
2.59

 
$
1.74