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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Stock Appreciation Rights (SARs) [Member] Common Stock [Member] | Stock Appreciation Rights (SARs) [Member] Additional Paid-in Capital [Member] | Stock Appreciation Rights (SARs) [Member] Retained Earnings [Member] | Stock Appreciation Rights (SARs) [Member] AOCI Attributable to Parent [Member] | Stock Appreciation Rights (SARs) [Member] | Restricted Stock [Member] Common Stock [Member] | Restricted Stock [Member] Additional Paid-in Capital [Member] | Restricted Stock [Member] Retained Earnings [Member] | Restricted Stock [Member] AOCI Attributable to Parent [Member] | Restricted Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
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Balance (in shares) at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  | 13,917,465 |  |  |  |
Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  | $ 14 | $ 33,806 | $ 65,392 | $ (6,522) | $ 92,690
Common shares issued upon exercise of options, net (in shares) |  |  |  |  |  |  |  |  |  |  | 251,996 |  |  |  |
Common shares issued upon exercise of options, net |  |  |  |  |  |  |  |  |  |  | $ 1 | 1,960 | (457) |  | 1,504
Restricted shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 333,190 |  |  |  |
Restricted shares issued |  |  |  |  |  |  |  |  |  |  |  | 4,558 |  |  | 4,558
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in shares) |  |  |  |  |  |  |  |  |  |  | 55,656 |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | 1,638 |  |  | $ 1,638
Tax withheld on exercise of Stock Appreciation Rights (SARs) |  | $ (405) |  |  | $ (405) |  |  |  |  |  |  |  |  |  |
Tax benefit from vesting of acquisition related restricted stock |  |  |  |  |  |  | $ 990 |  |  | $ 990 |  |  |  |  |
Purchase and retirement of common shares (in shares) |  |  |  |  |  |  |  |  |  |  | (45,100) |  |  |  | (45,100)
Purchase and retirement of common shares |  |  |  |  |  |  |  |  |  |  |  | (131) | (583) |  | $ (714)
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | (4,707) |  | (4,707)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 14,638 |  | 14,638
Cash flow hedges, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 95 | 95
Pensions, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 190 | 190
Change in currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 73 | 73
Comprehensive Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,996
Balance (in shares) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  | 14,513,207 |  |  |  |
Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  | $ 15 | 42,416 | 74,283 | (6,164) | $ 110,550
Common shares issued upon exercise of options, net (in shares) |  |  |  |  |  |  |  |  |  |  | 285,745 |  |  |  | 336,726
Common shares issued upon exercise of options, net |  |  |  |  |  |  |  |  |  |  |  | 2,779 | (907) |  | $ 1,872
Restricted shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 181,399 |  |  |  |
Restricted shares issued |  |  |  |  |  |  |  |  |  |  |  | 2,780 |  |  | 2,780
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in shares) |  |  |  |  |  |  |  |  |  |  | 101,596 |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | 1,664 |  |  | 1,664
Tax withheld on exercise of Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |  |  |  | (1,186) |  |  | (1,186)
Tax benefit from vesting of acquisition related restricted stock |  |  |  |  |  |  |  |  |  |  |  | 650 |  |  | $ 650
Purchase and retirement of common shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | (5,269) |  | $ (5,269)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 15,022 |  | 15,022
Cash flow hedges, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | (111) | (111)
Pensions, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,024) | (1,024)
Change in currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 | 20
Comprehensive Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,907
Balance (in shares) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  | 15,081,947 |  |  |  | 15,081,947
Balance at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  | $ 15 | 49,103 | 83,129 | (7,279) | $ 124,968
Common shares issued upon exercise of options, net (in shares) |  |  |  |  |  |  |  |  |  |  | 87,347 |  |  |  | 94,241
Common shares issued upon exercise of options, net |  |  |  |  |  |  |  |  |  |  |  | 878 | (151) |  | $ 727
Restricted shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 150,094 |  |  |  |
Restricted shares issued |  |  |  |  |  |  |  |  |  |  |  | 3,762 |  |  | 3,762
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in shares) |  |  |  |  |  |  |  |  |  |  | 3,428 |  |  |  |
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
Purchase and retirement of common shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (158,359)
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | (5,836) |  | $ (5,836)
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 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)
Comprehensive Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,269
ASC 606 adjustment to opening retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | 11,245 |  | 11,245
Common shares repurchased (in shares) |  |  |  |  |  |  |  |  |  |  | (158,359) |  |  |  |
Common shares repurchased |  |  |  |  |  |  |  |  |  |  |  | (576) | (2,330) |  | $ (2,906)
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  | 15,202,387 |  |  |  | 15,202,387
Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  | $ 15 | $ 55,859 | $ 103,032 | $ (7,985) | $ 150,921

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