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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Common Class A [Member] Retained Earnings [Member] | Common Class A [Member] Common Stock [Member] | Common Class A [Member] | Common Class B [Member] Retained Earnings [Member] | Common Class B [Member] Common Stock [Member] | Common Class B [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Additional Paid-in Capital [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  | $ 217 |  |  | $ 986 |  | $ 147,807 | $ (19,625) | $ 28,575 | $ 157,960
Net earnings (loss) |  |  |  |  |  |  | (1,303) |  |  | (1,303)
Dividends declared | $ (130) |  | $ (130) | $ (700) |  | $ (700) |  |  |  |
Forfeiture of restricted common stock |  |  |  |  | (1) |  |  |  |  |
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  | 1 |
Currency translation adjustment, net of taxes |  |  |  |  |  |  |  | 4,017 |  | 4,017
Stock-based compensation expense |  |  |  |  |  |  |  |  | 779 | 779
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  | 86 |  | 86
Unrealized losses on marketable securities arising during the period, net of taxes |  |  |  |  |  |  |  | (31) |  | (31)
Balance at Mar. 31, 2018 |  |  |  |  |  |  | 149,171 | (15,553) |  | 164,175
Balance at Dec. 31, 2017 |  | 217 |  |  | 986 |  | 147,807 | (19,625) | 28,575 | 157,960
Net earnings (loss) |  |  | 2,852 |  |  | 13,832 |  |  |  | 16,684
Dividends declared |  |  | (391) |  |  | (2,079) |  |  |  |
Currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  | (4,463)
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  | 256
Unrealized losses on marketable securities arising during the period, net of taxes |  |  |  |  |  |  |  |  |  | (201)
Balance at Sep. 30, 2018 |  | 217 |  |  | 1,007 |  | 165,518 | (24,033) | 30,602 | 173,311
Effect of adoption of ASU |  |  |  |  |  |  | 3,497 |  |  | 3,497
Balance at Mar. 31, 2018 |  |  |  |  |  |  | 149,171 | (15,553) |  | 164,175
Net earnings (loss) |  |  |  |  |  |  | 6,634 |  |  | 6,634
Dividends declared | (131) |  | (131) | (689) |  | (689) |  |  |  |
Forfeiture of restricted common stock |  |  |  |  | (1) |  |  |  |  |
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  | 1 |
Currency translation adjustment, net of taxes |  |  |  |  |  |  |  | (7,448) |  | (7,448)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 671 | 671
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  | 85 |  | 85
Balance at Jun. 30, 2018 |  | 217 |  |  | 984 |  | 154,985 | (22,916) | 30,027 | 163,297
Net earnings (loss) |  |  | 1,942 |  |  | 9,410 | 11,352 |  |  | 11,352
Dividends declared | (130) |  | (130) | (689) |  | (689) |  |  |  |
Forfeiture of restricted common stock |  |  |  |  | (1) |  |  |  |  |
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  | 1 |
Currency translation adjustment, net of taxes |  |  |  |  |  |  |  | (1,032) |  | (1,032)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 598
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  | 85
Issuance of restricted common stock |  |  |  |  | 24 |  |  |  | (24) |
Unrealized losses on marketable securities arising during the period, net of taxes |  |  |  |  |  |  |  | (170) |  | (170)
Balance at Sep. 30, 2018 |  | 217 |  |  | 1,007 |  | 165,518 | (24,033) | 30,602 | 173,311
Balance at Dec. 31, 2018 |  | 217 |  |  | 1,009 |  | 168,695 | (24,838) | 31,387 | 176,470
Net earnings (loss) |  |  |  |  |  |  | 1,131 |  |  | 1,131
Dividends declared | (130) |  | (130) | (708) |  | (708) |  |  |  |
Forfeiture of restricted common stock |  |  |  |  | (1) |  |  |  |  |
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  | 1 |
Currency translation adjustment, net of taxes |  |  |  |  |  |  |  | 540 |  | 540
Stock-based compensation expense |  |  |  |  |  |  |  |  | 813 | 813
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  | 37 |  | 37
Balance at Mar. 31, 2019 |  | 217 |  |  | 1,008 |  | 169,451 | (24,724) | 32,201 | 178,153
Balance at Dec. 31, 2018 |  | 217 |  |  | 1,009 |  | 168,695 | (24,838) | 31,387 | 176,470
Net earnings (loss) |  |  | (442) |  |  | (1,949) |  |  |  | (2,391)
Dividends declared |  |  | (392) |  |  | (2,124) |  |  |  |
Currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  | (2,854)
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  | 111
Unrealized losses on marketable securities arising during the period, net of taxes |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 |  | 214 |  |  | 1,013 |  | 164,252 | (28,045) | 33,206 | 170,640
Effect of adoption of ASU |  |  |  |  |  |  | 463 | (463) |  |
Balance at Mar. 31, 2019 |  | 217 |  |  | 1,008 |  | 169,451 | (24,724) | 32,201 | 178,153
Net earnings (loss) |  |  |  |  |  |  | 2,967 |  |  | 2,967
Dividends declared | (131) |  | (131) | (704) |  | (704) |  |  |  |
Forfeiture of restricted common stock |  |  |  |  | (1) |  |  |  |  |
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  | 1 |
Currency translation adjustment, net of taxes |  |  |  |  |  |  |  | (834) |  | (834)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 788 | 788
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  | 37 |  | 37
Issuance of restricted common stock |  |  |  |  | 7 |  |  |  | (7) |
Balance at Jun. 30, 2019 |  | 217 |  |  | 1,014 |  | 171,583 | (25,521) | 32,983 | 180,276
Net earnings (loss) |  |  | (1,112) |  |  | (5,378) | (6,490) |  |  | (6,490)
Dividends declared | $ (131) |  | $ (131) | $ (710) |  | $ (710) |  |  |  |
Forfeiture of restricted common stock |  |  |  |  | (1) |  |  |  |  |
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  | 1 |
Currency translation adjustment, net of taxes |  |  |  |  |  |  |  | (2,561) |  | (2,561)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 667 | 667
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  | 37 |  | 37
Repurchase of Class A common stock |  | (3) |  |  |  |  |  |  | (445) | (448)
Unrealized losses on marketable securities arising during the period, net of taxes |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 |  | $ 214 |  |  | $ 1,013 |  | $ 164,252 | $ (28,045) | $ 33,206 | $ 170,640

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