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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)

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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