Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Sales	$ 273,255	$ 261,921	$ 838,299	$ 723,771
Cost of Sales	165,170	157,317	500,778	434,877
Gross Profit	108,085	104,604	337,521	288,894
Operating Expense:
Research and Development Expense	7,506	7,907	23,408	24,239
Selling and Administrative Expense	85,140	85,711	269,273	246,993
Total Operating Expense	92,646	93,618	292,681	271,232
Profit from Operations	15,439	10,986	44,840	17,662
Other Income (Expense):
Interest Income	839	698	2,540	1,575
Interest Expense	(5,986)	(6,093)	(17,736)	(18,720)
Net Foreign Currency Transaction Losses	(295)	(842)	(1,381)	(2,375)
Other Expense, Net	(130)	(422)	(890)	(774)
Total Other Expense, Net	(5,572)	(6,659)	(17,467)	(20,294)
Profit (Loss) Before Income Taxes	9,867	4,327	27,373	(2,632)
Income Tax Expense	158	731	1,598	385
Net Earnings (Loss) Including Noncontrolling Interest	9,709	3,596	25,775	(3,017)
Net Earnings (Loss) Attributable to Noncontrolling Interest	33	37	81	(28)
Net Earnings (Loss) Attributable to Tennant Company	$ 9,676	$ 3,559	$ 25,694	$ (2,989)
Net Earnings (Loss) Attributable to Tennant Company per Share:
Basic	$ 0.54	$ 0.20	$ 1.43	$ (0.17)
Diluted	$ 0.52	$ 0.20	$ 1.40	$ (0.17)
Weighted Average Shares Outstanding:
Basic	17,998,917	17,729,857	17,911,880	17,673,656
Diluted	18,439,621	18,171,444	18,344,813	17,673,656
Cash Dividend Declared per Common Share	$ 0.21	$ 0.21	$ 0.63	$ 0.63