Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Sales	$ 261,921	$ 200,134	$ 723,771	$ 596,826
Cost of Sales	157,317	114,839	434,877	338,740
Gross Profit	104,604	85,295	288,894	258,086
Operating Expense:
Research and Development Expense	7,907	8,418	24,239	24,712
Selling and Administrative Expense	85,651	60,623	247,067	187,315
Loss on Sale of Business	0	0	0	149
Total Operating Expense	93,558	69,041	271,306	212,176
Profit from Operations	11,046	16,254	17,588	45,910
Other Income (Expense):
Interest Income	698	107	1,575	188
Interest Expense	(6,093)	(329)	(18,720)	(919)
Net Foreign Currency Transaction (Losses) Gains	(842)	(149)	(2,375)	175
Other Expense, Net	(482)	(10)	(700)	(360)
Total Other Expense, Net	(6,719)	(381)	(20,220)	(916)
Profit (Loss) Before Income Taxes	4,327	15,873	(2,632)	44,994
Income Tax Expense	731	4,396	385	13,750
Net Earnings (Loss) Including Noncontrolling Interest	3,596	11,477	(3,017)	31,244
Net Earnings (Loss) Attributable to Noncontrolling Interest	37	0	(28)	0
Net Earnings (Loss) Attributable to Tennant Company	$ 3,559	$ 11,477	$ (2,989)	$ 31,244
Net Earnings (Loss) Attributable to Tennant Company per Share:
Basic	$ 0.20	$ 0.66	$ (0.17)	$ 1.78
Diluted	$ 0.20	$ 0.64	$ (0.17)	$ 1.74
Weighted Average Shares Outstanding:
Basic	17,729,857	17,498,808	17,673,656	17,516,941
Diluted	18,171,444	17,973,206	17,673,656	17,955,499
Cash Dividend Declared per Common Share	$ 0.21	$ 0.20	$ 0.63	$ 0.60