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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Class A Common Stock [Member] | Class B Common Stock [Member] | Retained Earnings [Member] | Retained Earnings [Member] Class A Common Stock [Member] | Retained Earnings [Member] Class B Common Stock [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Common Stock [Member] | Common Stock [Member] Class A Common Stock [Member] | Common Stock [Member] Class B Common Stock [Member] | Additional Paid-in Capital [Member]
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Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption of ASU | ASU 2014-09 [Member] | $ 3,497 |  |  | $ 3,497 |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | 157,960 |  |  | 147,807 |  |  | $ (19,625) |  | $ 217 | $ 986 | $ 28,575
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) | 5,332 | $ 901 | $ 4,431 | 5,332 |  |  |  | $ 0 |  |  |
Dividends declared |  | (261) | (1,390) |  | $ (261) | $ (1,390) |  |  |  |  |
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  |  | (2) | 2
Foreign currency translation adjustment, net of taxes | (3,431) |  |  |  |  |  | (3,431) |  |  |  |
Unrealized holding losses on marketable securities arising during the year, net of taxes | (31) |  |  |  |  |  | (31) |  |  |  |
Stock-based compensation expense | 1,450 |  |  |  |  |  |  |  |  |  | 1,450
Change in unfunded SERP liability, net of taxes | 171 |  |  |  |  |  | 171 |  |  |  |
Balance at end of period at Jun. 30, 2018 | 163,297 |  |  | 154,985 |  |  | (22,916) |  | 217 | 984 | 30,027
Balance at beginning of period at Mar. 31, 2018 | 164,175 |  |  | 149,171 |  |  | (15,553) |  | 217 | 985 | 29,355
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) | 6,634 | 1,141 | 5,493 | 6,634 |  |  |  | 0 |  |  |
Dividends declared |  | (131) | (689) |  | (131) | (689) |  |  |  |  |
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  |  | (1) | 1
Foreign currency translation adjustment, net of taxes | (7,448) |  |  |  |  |  | (7,448) |  |  |  |
Unrealized holding losses on marketable securities arising during the year, net of taxes | 0 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 671 |  |  |  |  |  |  |  |  |  | 671
Change in unfunded SERP liability, net of taxes | 85 |  |  |  |  |  | 85 |  |  |  |
Balance at end of period at Jun. 30, 2018 | 163,297 |  |  | 154,985 |  |  | (22,916) |  | 217 | 984 | 30,027
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption of ASU |  |  |  |  |  |  | (463) |  |  |  |
Effect of adoption of ASU | ASU 2018-02 [Member] | 0 |  |  | 463 |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 176,470 |  |  | 168,695 |  |  | (24,838) |  | 217 | 1,009 | 31,387
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) | 4,098 | 673 | 3,425 | 4,098 |  |  |  | 0 |  |  |
Dividends declared |  | (261) | (1,412) |  | (261) | (1,412) |  |  |  |  |
Issuance of restricted common stock | 0 |  |  |  |  |  |  |  |  | 7 | (7)
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  |  | (2) | 2
Foreign currency translation adjustment, net of taxes | (294) |  |  |  |  |  | (294) |  |  |  |
Unrealized holding losses on marketable securities arising during the year, net of taxes | 0 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 1,601 |  |  |  |  |  |  |  |  |  | 1,601
Change in unfunded SERP liability, net of taxes | 74 |  |  |  |  |  | 74 |  |  |  |
Balance at end of period at Jun. 30, 2019 | 180,276 |  |  | 171,583 |  |  | (25,521) |  | 217 | 1,014 | 32,983
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption of ASU | ASU 2018-02 [Member] |  |  |  | 463 |  |  | (463) |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | 178,153 |  |  | 169,451 |  |  | (24,724) |  | 217 | 1,008 | 32,201
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) | 2,967 | 494 | 2,473 | 2,967 |  |  |  | $ 0 |  |  |
Dividends declared |  | $ (131) | $ (704) |  | $ (131) | $ (704) |  |  |  |  |
Issuance of restricted common stock | 0 |  |  |  |  |  |  |  |  | 7 | (7)
Forfeiture of restricted common stock | 0 |  |  |  |  |  |  |  |  | (1) | 1
Foreign currency translation adjustment, net of taxes | (834) |  |  |  |  |  | (834) |  |  |  |
Unrealized holding losses on marketable securities arising during the year, net of taxes | 0 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 788 |  |  |  |  |  |  |  |  |  | 788
Change in unfunded SERP liability, net of taxes | 37 |  |  |  |  |  | 37 |  |  |  |
Balance at end of period at Jun. 30, 2019 | $ 180,276 |  |  | $ 171,583 |  |  | (25,521) |  | $ 217 | $ 1,014 | $ 32,983
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption of ASU | ASU 2018-02 [Member] |  |  |  |  |  |  | $ (463) |  |  |  |

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