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Note 19 - Income Attributable to Tennant Company Per Share - Computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income attributable to Tennant Company	$ 64.9	$ 33.7	$ 45.8
Basic - weighted average shares outstanding (in shares)	18,499,674	18,349,724	18,118,486
Diluted - weighted average shares outstanding (in shares)	18,849,217	18,635,002	18,453,145
Basic earnings per share attributable to Tennant Company (in dollars per share)	$ 3.51	$ 1.84	$ 2.53
Diluted earnings per share attributable to Tennant Company (in dollars per share)	$ 3.44	$ 1.81	$ 2.48

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

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