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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] 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, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 187,935 | $ (18,863) | $ 214 | $ 1,038 | $ 0 | $ 38,419 | $ 208,743
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,064 | 0 | 0 | 0 | 0 | 0 | 5,064
Cash dividends declared on common stock | $ (129) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (129) | $ (727) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (727) |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (1) | 0 |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1,216) | 0 | 0 | 0 | 0 | (1,216)
Unrealized gains on interest rate swap cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 2,984 | 0 | 0 | 0 | 0 | 2,984
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 576 | 576
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 61 | 0 | 0 | 0 | 0 | 61
Balance at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 192,143 | (17,034) | 214 | 1,037 | 0 | 38,996 | 215,356
Balance at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 187,935 | (18,863) | 214 | 1,038 | 0 | 38,419 | 208,743
Net earnings |  |  |  |  |  |  | 3,614 |  |  |  |  |  |  | 18,488 |  |  |  |  |  |  | 22,102
Cash dividends declared on common stock |  |  |  |  |  |  | (258) |  |  |  |  |  |  | (1,453) |  |  |  |  |  |  |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,980)
Unrealized holding gains on marketable securities, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12)
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 122
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,326 | (22,741) | 214 | 1,036 | (349) | 39,509 | 225,995
Balance at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 192,143 | (17,034) | 214 | 1,037 | 0 | 38,996 | 215,356
Net earnings |  |  |  |  |  |  | 2,793 |  |  |  |  |  |  | 14,245 | 17,038 | 0 | 0 | 0 | 0 | 0 | 17,038
Cash dividends declared on common stock | (129) | 0 | 0 | 0 | 0 | 0 | (129) | (726) | 0 | 0 | 0 | 0 | 0 | (726) |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (1) | 0 |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (6,764) | 0 | 0 | 0 | 0 | (6,764)
Unrealized gains on interest rate swap cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,008 | 0 | 0 | 0 | 0 | 1,008
Unrealized holding gains on marketable securities, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (12) | 0 | 0 | 0 | 0 | (12)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 512 | 512
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 61 | 0 | 0 | 0 | 0 | 61
Repurchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | (349) | 0 | (349)
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,326 | (22,741) | 214 | 1,036 | (349) | 39,509 | 225,995
Balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 237,188 | (16,546) | 214 | 1,067 | (349) | 40,772 | 262,346
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,998 | 0 | 0 | 0 | 0 | 1,998
Unrealized gains on interest rate swap cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (894) | 0 | 0 | 0 | 0 | (894)
Unrealized holding gains on marketable securities, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 237,188 | (16,546) | 214 | 1,067 | (349) | 40,772 | 262,346
Net earnings |  |  |  |  |  |  | 6,790 |  |  |  |  |  |  | 35,557 |  |  |  |  |  |  | 42,347
Cash dividends declared on common stock |  |  |  |  |  |  | (257) |  |  |  |  |  |  | (1,490) |  |  |  |  |  |  |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (233)
Unrealized holding gains on marketable securities, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27
Balance at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 277,790 | (16,856) | 214 | 1,064 | (349) | 42,627 | 304,490
Balance at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,885 | (15,428) | 214 | 1,066 | (349) | 41,675 | 278,063
Net earnings |  |  |  |  |  |  | 4,458 |  |  |  |  |  |  | 23,317 | 27,775 | 0 | 0 | 0 | 0 | 0 | 27,775
Cash dividends declared on common stock | $ (128) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (128) | $ (742) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (742) |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (3) | 0 |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (2,231) | 0 | 0 | 0 | 0 | (2,231)
Unrealized gains on interest rate swap cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 789 | 0 | 0 | 0 | 0 | 789
Unrealized holding gains on marketable securities, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 950 | 950
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 14 | 0 | 0 | 0 | 0 | 14
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 1 | 0 | (1) | 0
Balance at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 277,790 | $ (16,856) | $ 214 | $ 1,064 | $ (349) | $ 42,627 | $ 304,490

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