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Earnings Per Share (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]    
Computation of Basic and Diluted Earnings per Share
The computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company per Share were as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net Earnings (Loss) Attributable to Tennant Company
$
3,559

 
$
11,477

 
$
(2,989
)
 
$
31,244

Denominator:
 
 
 
 
 
 
 
Basic - Weighted Average Shares Outstanding
17,729,857

 
17,498,808

 
17,673,656

 
17,516,941

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-Based Compensation Plans
441,587

 
474,398

 
—

 
438,558

Diluted - Weighted Average Shares Outstanding
18,171,444

 
17,973,206

 
17,673,656

 
17,955,499

Basic Earnings (Loss) per Share
$
0.20

 
$
0.66

 
$
(0.17
)
 
$
1.78

Diluted Earnings (Loss) per Share
$
0.20

 
$
0.64

 
$
(0.17
)
 
$
1.74

 
The computations of Basic and Diluted Earnings per Share for the years ended December 31 were as follows:
 
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Net Earnings
$
46,614

 
$
32,088

 
$
50,651

Denominator:
 

 
 

 
 

Basic - Weighted Average Shares Outstanding
17,523,267

 
18,015,151

 
18,217,384

Effect of dilutive securities
452,916

 
478,296

 
523,474

Diluted - Weighted Average Shares Outstanding
17,976,183

 
18,493,447

 
18,740,858

Basic Earnings per Share
$
2.66

 
$
1.78

 
$
2.78

Diluted Earnings per Share
$
2.59

 
$
1.74

 
$
2.70