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Acquisition (Details 3) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Sales
As reported	$ 272,847	$ 191,059
Net Loss Attributable to Tennant Company
As reported	$ 3,274	$ (3,957)
Net Loss Attributable to Tennant Company per Share
As reported	$ 0.18	$ (0.22)
IP Cleaning S.p.A
Net Sales
Pro forma		$ 245,120
Net Loss Attributable to Tennant Company
Pro forma		$ (2,426)
Net Loss Attributable to Tennant Company per Share
Pro forma		$ (0.14)

X

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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