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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Class A [Member] Retained Earnings [Member] | Common Class A [Member] AOCI Attributable to Parent [Member] | Common Class A [Member] Common Stock, Common Class A [Member] | Common Class A [Member] Common Stock, Common Class B [Member] | Common Class A [Member] Additional Paid-in Capital [Member] | Common Class A [Member] | Common Class B [Member] Retained Earnings [Member] | Common Class B [Member] AOCI Attributable to Parent [Member] | Common Class B [Member] Common Stock, Common Class A [Member] | Common Class B [Member] Common Stock, Common Class B [Member] | Common Class B [Member] Additional Paid-in Capital [Member] | Common Class B [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock, Common Class A [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock, Common Class B [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Common Stock, Common Class A [Member] | Common Stock, Common Class B [Member] | Additional Paid-in Capital [Member] | Total
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Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  | $ 463 | $ (463) | $ 0 | $ 0 | $ 0 | $ 0 | $ 168,695 | $ (24,838) | $ 217 | $ 1,009 | $ 31,387 | $ 176,470
Net earnings (loss) |  |  |  |  |  | $ (1,531) |  |  |  |  |  | $ (7,212) |  |  |  |  |  |  | (8,743) | 0 | 0 | 0 | 0 | (8,743)
Cash dividends declared on common stock | $ (518) | $ 0 | $ 0 | $ 0 | $ 0 | (518) | $ (2,834) | $ 0 | $ 0 | $ 0 | $ 0 | (2,834) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 7 | (7) | 0
Repurchase of Class A common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (3) | 0 | (445) | (448)
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (3) |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 2,603 | 0 | 0 | 0 | 2,603
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 2,888 | 2,888
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1,367) | 0 | 0 | 0 | (1,367)
Unrealized holding losses on marketable securities arising during the year, net of taxes of $7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Balance at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 157,063 | (24,065) | 214 | 1,013 | 33,826 | 168,051
Net earnings (loss) |  |  |  |  |  | 2,089 |  |  |  |  |  | 10,706 |  |  |  |  |  |  | 12,795 | 0 | 0 | 0 | 0 | 12,795
Cash dividends declared on common stock | $ (515) | $ 0 | $ 0 | $ 0 | $ 0 | $ (515) | $ (2,852) | $ 0 | $ 0 | $ 0 | $ 0 | $ (2,852) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 11 | (11) | 0
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (3) |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 6,890 | 0 | 0 | 0 | 6,890
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 2,318 | 2,318
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (895) | 0 | 0 | 0 | (895)
Unrealized holding losses on marketable securities arising during the year, net of taxes of $7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 7 | 0 | 0 | 0 | 7
Balance at Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 166,491 | $ (18,063) | $ 214 | $ 1,021 | $ 36,136 | $ 185,799

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