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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Tennant Company Shareholders' Equity
Noncontrolling Interest
Beginning balance at Dec. 31, 2014 $ 280,651 $ 6,906 $ 26,247 $ 286,091 $ (38,593) $ 280,651 $ 0
Balance (in shares) at Dec. 31, 2014   18,415,047          
Increase (Decrease) in Stockholders' Equity              
Net (Loss) Earnings 32,088 $ 0 0 32,088 0 32,088 0
Other Comprehensive Income (Loss) (9,536) $ 0 0 0 (9,536) (9,536) 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) (in shares)   93,380          
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) 419 $ 35 384 0 0 419 0
Share-Based Compensation 8,222 0 8,222 0 0 8,222 0
Dividends paid ($0.80, $0.81 and $0.84) per Common Share (14,498) 0 0 (14,498) 0 (14,498) 0
Tax Benefit on Stock Plans 859 $ 0 859 0 0 859 0
Purchases of Common Stock (in shares)   (764,046)          
Purchases of Common Stock (45,998) $ (287) (35,712) (9,999) 0 (45,998) 0
Balance (in shares) at Dec. 31, 2015   17,744,381          
Ending balance at Dec. 31, 2015 252,207 $ 6,654 0 293,682 (48,129) 252,207 0
Increase (Decrease) in Stockholders' Equity              
Net (Loss) Earnings 46,614 0 0 46,614 0 46,614 0
Other Comprehensive Income (Loss) (1,794) $ 0 0 0 (1,794) (1,794) 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) (in shares)   190,443          
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) 4,010 $ 71 3,939 0 0 4,010 0
Share-Based Compensation 3,875 0 3,875 0 0 3,875 0
Dividends paid ($0.80, $0.81 and $0.84) per Common Share (14,293) 0 0 (14,293) 0 (14,293) 0
Tax Benefit on Stock Plans 686 $ 0 686 0 0 686 0
Purchases of Common Stock (in shares)   (246,474)          
Purchases of Common Stock $ (12,762) $ (92) (4,847) (7,823) 0 (12,762) 0
Balance (in shares) at Dec. 31, 2016 17,688,350 17,688,350          
Ending balance at Dec. 31, 2016 $ 278,543 $ 6,633 3,653 318,180 (49,923) 278,543 0
Increase (Decrease) in Stockholders' Equity              
Net (Loss) Earnings (6,205) 0 0 (6,195) 0 (6,195) (10)
Other Comprehensive Income (Loss) 27,600 $ 0 0 0 27,600 27,600 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) (in shares)   192,827          
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) 5,617 $ 72 5,545 0 0 5,617 0
Share-Based Compensation 5,891 0 5,891 0 0 5,891 0
Dividends paid ($0.80, $0.81 and $0.84) per Common Share (14,953) 0 0 (14,953) 0 (14,953) 0
Tax Benefit on Stock Plans 2,028 $ 0 0 0 0 0 2,028
Purchases of Common Stock (in shares)   0          
Purchases of Common Stock (30) $ 0 0 0 0 0 (30)
Other $ (17) $ 0 0 0 0 0 (17)
Balance (in shares) at Dec. 31, 2017 17,881,177 17,881,177          
Ending balance at Dec. 31, 2017 $ 298,474 $ 6,705 $ 15,089 $ 297,032 $ (22,323) $ 296,503 $ 1,971