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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Stock Appreciation Rights (SARs) [Member] Common Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  | 15,081,947 |  |  |  |
Balance at Dec. 31, 2017 |  | $ 15 | $ 49,103 | $ 83,129 | $ (7,279) | $ 124,968
ASC 606 adjustment to opening retained earnings |  |  |  | 11,245 |  | 11,245
Common shares issued upon exercise of options (in shares) |  | 87,347 |  |  |  |
Common shares issued upon exercise of options |  |  | 878 | (151) |  | 727
Restricted shares issued in acquisition (in shares) |  | 150,094 |  |  |  |
Restricted shares issued in acquisition |  |  | 3,762 |  |  | 3,762
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in shares) | 3,428 | 37,930,000 |  |  |  |
Share-based compensation expense |  |  | 2,264 |  |  | 2,264
Tax withheld on exercise of Stock Appreciation Rights (SARs) |  |  | (17) |  |  | (17)
Tax benefit from vesting of acquisition-related restricted stock |  |  | 445 |  |  | 445
Cash dividends declared |  |  |  | (5,836) |  | $ (5,836)
Common stock reacquired and retired (in shares) |  | (158,359) |  |  |  | (58,216)
Common stock reacquired and retired |  |  | (576) | (2,330) |  | $ (2,906)
Net earnings |  |  |  | 16,975 |  | 16,975
Cash flow hedges, net of taxes |  |  |  |  | 203 | 203
Pensions, net of taxes |  |  |  |  | (391) | (391)
Change in currency translation adjustment, net of taxes |  |  |  |  | (518) | (518)
Cash flow hedges, net of taxes |  |  |  |  |  | 203
Balance (in shares) at Dec. 31, 2018 |  | 15,202,387 |  |  |  |
Balance at Dec. 31, 2018 |  | $ 15 | 55,859 | 103,032 | (7,985) | 150,921
Common shares issued upon exercise of options (in shares) |  | 62,994 |  |  |  |
Common shares issued upon exercise of options |  |  | 460 | (177) |  | 283
Restricted shares issued in acquisition (in shares) |  | 69,530 |  |  |  |
Restricted shares issued in acquisition |  |  |  |  |  | 0
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in shares) |  |  |  |  |  |
Share-based compensation expense |  |  | 1,484 |  |  | 1,484
Tax benefit from vesting of acquisition-related restricted stock |  |  | 30 |  |  | 30
Cash dividends declared |  |  |  | (6,046) |  | $ (6,046)
Common stock reacquired and retired (in shares) |  | (107,307) |  |  |  | (49,091)
Net earnings |  |  |  | 12,066 |  | $ 12,066
Cash flow hedges, net of taxes |  |  |  |  | (22) | (22)
Pensions, net of taxes |  |  |  |  | 449 | 449
Change in currency translation adjustment, net of taxes |  |  |  |  | 74 | 74
Common stock reacquired and retired |  |  | (391) | (1,294) |  | (1,685)
Cash flow hedges, net of taxes |  |  |  |  |  | $ (22)
Balance (in shares) at Dec. 31, 2019 |  | 15,227,604 |  |  |  | 15,227,604
Balance at Dec. 31, 2019 |  | $ 15 | 57,442 | 107,581 | (7,484) | $ 157,554
Common shares issued upon exercise of options (in shares) |  |  |  |  |  | 154,396
Common shares issued upon exercise of options |  |  | 2,110 | (183) |  | $ 1,927
Restricted shares issued in acquisition (in shares) |  | 49,784 |  |  |  |
Restricted shares issued in acquisition |  |  |  |  |  | 0
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in shares) |  | 157,730 |  |  |  |
Share-based compensation expense |  |  | 2,530 |  |  | 2,530
Tax withheld on exercise of Stock Appreciation Rights (SARs) |  |  | (66) |  |  | (66)
Tax benefit from vesting of acquisition-related restricted stock |  |  | (13) |  |  | (13)
Cash dividends declared |  |  |  | (6,111) |  | $ (6,111)
Common stock reacquired and retired (in shares) |  | (43,458) |  |  |  | (43,458)
Net earnings |  |  |  | 41,026 |  | $ 41,026
Change in currency translation adjustment, net of taxes |  |  |  |  | (1,021) | (1,021)
Common stock reacquired and retired |  |  | (159) | (341) |  | (500)
Cash flow hedges, net of taxes |  |  |  |  | (22) | (22)
Pensions, net of taxes |  |  |  |  | (3,674) | $ (3,674)
Balance (in shares) at Dec. 31, 2020 |  | 15,391,660 |  |  |  | 15,391,660
Balance at Dec. 31, 2020 |  | $ 15 | $ 61,844 | $ 141,972 | $ (12,201) | $ 191,630

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