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Earnings (Loss) Attributable to Tennant Company Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net Earnings (Loss) Attributable to Tennant Company	$ 3,274	$ (3,957)
Denominator:
Basic - Weighted Average Shares Outstanding	17,790,989	17,596,546
Effect of dilutive securities:
Share-based compensation plans	454,370	0
Diluted - Weighted Average Shares Outstanding	18,245,359	17,596,546
Basic Earnings (Loss) per Share	$ 0.18	$ (0.22)
Diluted Earnings (Loss) per Share	$ 0.18	$ (0.22)
Anti-dilutive securities excluded from earnings per share calculation	291,622	663,306

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