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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ 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] Treasury Stock, Common [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] Treasury Stock, Common [Member] | Common Class B [Member] Additional Paid-in Capital [Member] | Common Class B [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Common Stock, Common Class A [Member] | Common Stock, Common Class B [Member] | Treasury Stock, Common [Member] | Additional Paid-in Capital [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 237,188 | $ (16,546) | $ 214 | $ 1,067 | $ (349) | $ 40,772 | $ 262,346
Balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,142 | 10,643 |  |  |
Net earnings |  |  |  |  |  |  | $ 2,331 |  |  |  |  |  |  | $ 12,241 | 14,572 | 0 | $ 0 | $ 0 | 0 | 0 | 14,572
Cash dividends declared on common stock | $ (128) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | (128) | $ (747) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | (747) |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 0 | $ (1) | 0 |  | 0
Forfeiture of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (10) |  |  |
Forfeiture of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0) | 10 |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 0 | $ (1) | 0 |  | 0
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Foreign currency translation adjustment, net of taxes of $26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,998 | 0 | 0 | 0 | 0 | 1,998
Unrealized holding gains on interest rate swap cash flow hedge, net of taxes of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (894) | 0 | 0 | 0 | 0 | (894)
Unrealized holding gains on marketable securities, net of taxes of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1 | 0 | 0 | 0 | 0 | 1
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 902 | 902
Change in unfunded SERP liability, net of taxes of ($4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 13 | 0 | 0 | 0 | 0 | 13
Balance at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,885 | (15,428) | $ 214 | $ 1,066 | (349) | 41,675 | 278,063
Balance (in shares) at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,142 | 10,633 |  |  |
Balance at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 307,510 | (12,037) | $ 214 | $ 1,065 | (454) | 44,260 | 340,558
Balance (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,142 | 10,620 |  |  |
Net earnings |  |  |  |  |  |  | 2,545 |  |  |  |  |  |  | 13,329 | 15,874 | 0 | $ 0 | $ 0 | 0 | 0 | 15,874
Cash dividends declared on common stock | $ (129) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (129) | $ (747) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (747) |  |  |  |  |  |  |
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 0 | $ 6 | $ 0 | (6) | 0
Issuance of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 58 |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 0 | $ (6) |  |  | 0
Forfeiture of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Forfeiture of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0) | 0 | 0 |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 0 | $ (6) |  |  | 0
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Purchases of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ (1) | $ (10) | $ (6,283) |  | (6,283)
Purchases of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11) | (98) |  |  |
Purchases of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
Foreign currency translation adjustment, net of taxes of $26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (3,776) | $ 0 | $ 0 | 0 | 0 | (3,776)
Unrealized holding gains on interest rate swap cash flow hedge, net of taxes of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 340 | 0 | 0 | 0 | 0 | 340
Unrealized holding gains on marketable securities, net of taxes of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1 | 0 | 0 | 0 | 0 | 1
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 804 | 804
Change in unfunded SERP liability, net of taxes of ($4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 15 | 0 | 0 | 0 | 0 | 15
Balance at Mar. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 322,508 | $ (15,457) | $ 213 | $ 1,061 | $ (6,737) | $ 45,069 | $ 346,657
Balance (in shares) at Mar. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,131 | 10,574 |  |  |

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