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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] 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
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,131 | 0 | 0 | 0 | 0 | 1,131
Cash dividends declared on common stock | $ (130) | $ 0 | $ 0 | $ 0 | $ 0 | $ (130) | $ (708) | $ 0 | $ 0 | $ 0 | $ 0 | $ (708) |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (1) |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 540 | 0 | 0 | 0 | 540
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 813 | 813
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 37 | 0 | 0 | 0 | 37
Balance at Mar. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 169,451 | (24,724) | 217 | 1,008 | 32,201 | 178,153
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) |  |  |  |  |  | 673 |  |  |  |  |  | 3,425 |  |  |  |  |  |  |  |  |  |  |  | 4,098
Cash dividends declared on common stock |  |  |  |  |  | (261) |  |  |  |  |  | (1,412) |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (294)
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74
Balance at Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 171,583 | (25,521) | 217 | 1,014 | 32,983 | 180,276
Balance at Mar. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 169,451 | (24,724) | 217 | 1,008 | 32,201 | 178,153
Net earnings (loss) |  |  |  |  |  | 494 |  |  |  |  |  | 2,473 |  |  |  |  |  |  | 2,967 | 0 | 0 | 0 | 0 | 2,967
Cash dividends declared on common stock | (131) | 0 | 0 | 0 | 0 | (131) | (704) | 0 | 0 | 0 | 0 | (704) |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (1) |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (834) | 0 | 0 | 0 | (834)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  | 788
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 37 | 0 | 0 | 0 | 37
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | (7) | 0
Balance at Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 171,583 | (25,521) | 217 | 1,014 | 32,983 | 180,276
Balance at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 157,063 | (24,065) | 214 | 1,013 | 33,826 | 168,051
Net earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,804) | 0 | 0 | 0 | 0 | (3,804)
Cash dividends declared on common stock | (130) | 0 | 0 | 0 | 0 | (130) | (709) | 0 | 0 | 0 | 0 | (709) |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (1) |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (2,245) | 0 | 0 | 0 | (2,245)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 603 | 603
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 66 | 0 | 0 | 0 | 66
Balance at Mar. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152,420 | (26,244) | 214 | 1,012 | 34,430 | 161,832
Balance at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 157,063 | (24,065) | 214 | 1,013 | 33,826 | 168,051
Net earnings (loss) |  |  |  |  |  | 274 |  |  |  |  |  | 1,495 |  |  |  |  |  |  |  |  |  |  |  | 1,769
Cash dividends declared on common stock |  |  |  |  |  | (259) |  |  |  |  |  | (1,416) |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,569)
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132
Balance at Jun. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 157,157 | (25,502) | 214 | 1,023 | 35,036 | 167,928
Balance at Mar. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152,420 | (26,244) | 214 | 1,012 | 34,430 | 161,832
Net earnings (loss) |  |  |  |  |  | 923 |  |  |  |  |  | 4,650 |  |  |  |  |  |  | 5,573 | 0 | 0 | 0 | 0 | 5,573
Cash dividends declared on common stock | $ (129) | $ 0 | $ 0 | $ 0 | $ 0 | $ (129) | $ (707) | $ 0 | $ 0 | $ 0 | $ 0 | $ (707) |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 11 |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11) |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 676 | 0 | 0 | 0 | 676
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 617 | 617
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 66 | 0 | 0 | 0 | 66
Balance at Jun. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,157 | $ (25,502) | $ 214 | $ 1,023 | $ 35,036 | $ 167,928

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