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Note 19 - Earnings Attributable to Tennant Company Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net Earnings Attributable to Tennant Company |  | $ | 33.7 |  |  | $ | 45.8 |  |  | $ | 33.4 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic - Weighted Average Shares Outstanding |  |  | 18,349,724 |  |  |  | 18,118,486 |  |  |  | 17,940,438 |
Effect of dilutive securities |  |  | 285,278 |  |  |  | 334,659 |  |  |  | 398,131 |
Diluted - Weighted Average Shares Outstanding |  |  | 18,635,002 |  |  |  | 18,453,145 |  |  |  | 18,338,569 |
Basic Earnings per Share |  | $ | 1.84 |  |  | $ | 2.53 |  |  | $ | 1.86 |
Diluted Earnings per Share |  | $ | 1.81 |  |  | $ | 2.48 |  |  | $ | 1.82 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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