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Acquisitions (Details 3) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Sales
Net Sales	$ 285,212	$ 273,255	$ 292,197	$ 272,847	$ 279,295	$ 261,921	$ 270,791	$ 191,059	$ 1,123,511	$ 1,003,066	$ 808,572
Net Earnings (Loss) Attributable to Tennant Company
As reported	$ 7,717	$ 9,676	$ 12,744	$ 3,274	$ (3,206)	$ 3,559	$ (2,591)	$ (3,957)	$ 33,412	$ (6,195)	$ 46,614
Net Earnings (Loss) Attributable to Tennant Company per Diluted Share
As reported (in dollars per share)	$ 0.42	$ 0.52	$ 0.69	$ 0.18	$ (0.18)	$ 0.20	$ (0.15)	$ (0.22)	$ 1.82	$ (0.35)	$ 2.59
IP Cleaning S.p.A
Net Sales
Pro forma										$ 1,057,127	$ 1,013,710
Net Earnings (Loss) Attributable to Tennant Company
Pro forma										$ 12,288	$ 30,412
Net Earnings (Loss) Attributable to Tennant Company per Diluted Share
Pro forma (in dollars per share)										$ 0.68	$ 1.69

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