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Earnings (Loss) Attributable to Tennant Company Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net Earnings (Loss) Attributable to Tennant Company	$ 12,744	$ (2,591)	$ 16,018	$ (6,548)
Denominator:
Basic - Weighted Average Shares Outstanding	17,943,450	17,693,102	17,867,641	17,645,090
Effect of dilutive securities:
Share-based compensation plans	428,088	0	436,319	0
Diluted - Weighted Average Shares Outstanding	18,371,538	17,693,102	18,303,960	17,645,090
Basic Earnings (Loss) per Share	$ 0.71	$ (0.15)	$ 0.90	$ (0.37)
Diluted Earnings (Loss) per Share	$ 0.69	$ (0.15)	$ 0.88	$ (0.37)
Anti-dilutive securities excluded from earnings per share calculation	186,833	735,377	311,907	716,401

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