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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 [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 [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 [Member] | Additional Paid-in Capital [Member] | Total
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Balance at Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 166,491 | $ (18,063) | $ 214 | $ 1,021 |  | $ 36,136 | $ 185,799
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,199 | 0 | 0 | 0 |  | 0 | 3,199
Cash dividends declared on common stock | $ (128) | $ 0 | $ 0 | $ 0 |  | $ 0 | $ (128) | $ (716) | $ 0 | $ 0 | $ 0 |  | $ 0 | $ (716) |  |  |  |  |  |  |
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 | (2,529) | 0 | 0 |  | 0 | (2,529)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  | 600 | 600
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 99 | 0 | 0 |  | 0 | 99
Unrealized holding (losses) gains on marketable securities, net of taxes of $0 in all periods presented |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1) | 0 | 0 |  | 0 | (1)
Unrealized holding losses on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1) | 0 | 0 |  | 0 | (1)
Balance at Mar. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 168,846 | (20,494) | 214 | 1,020 |  | 36,737 | 186,323
Balance at Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166,491 | (18,063) | 214 | 1,021 |  | 36,136 | 185,799
Net earnings |  |  |  |  |  |  | 2,761 |  |  |  |  |  |  | 14,052 |  |  |  |  |  |  | 16,813
Cash dividends declared on common stock |  |  |  |  |  |  | (386) |  |  |  |  |  |  | (2,149) |  |  |  |  |  |  |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,971)
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 299
Unrealized holding (losses) gains on marketable securities, net of taxes of $0 in all periods presented |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45
Unrealized holding losses on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45
Balance at Sep. 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180,769 | (19,690) | 214 | 1,026 |  | 37,883 | 200,202
Balance at Mar. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 168,846 | (20,494) | 214 | 1,020 |  | 36,737 | 186,323
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,880 | 0 | 0 | 0 |  | 0 | 7,880
Cash dividends declared on common stock | (129) | 0 | 0 | 0 |  | 0 | (129) | (714) | 0 | 0 | 0 |  | 0 | (714) |  |  |  |  |  |  |
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 | 2,540 | 0 | 0 |  | 0 | 2,540
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  | 598 | 598
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 100 | 0 | 0 |  | 0 | 100
Issuance of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 8 |  | (8) | 0
Balance at Jun. 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,883 | (17,854) | 214 | 1,027 |  | 37,328 | 196,598
Net earnings |  |  |  |  |  |  | 940 |  |  |  |  |  |  | 4,794 | 5,734 | 0 | 0 | 0 |  | 0 | 5,734
Cash dividends declared on common stock | (129) | 0 | 0 | 0 |  | 0 | (129) | (719) | 0 | 0 | 0 |  | 0 | (719) |  |  |  |  |  |  |
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 | (1,982) | 0 | 0 |  | 0 | (1,982)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  | 554 | 554
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 100 | 0 | 0 |  | 0 | 100
Unrealized holding (losses) gains on marketable securities, net of taxes of $0 in all periods presented |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 46 | 0 | 0 |  | 0 | 46
Unrealized holding losses on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 46 | 0 | 0 |  | 0 | 46
Balance at Sep. 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180,769 | (19,690) | 214 | 1,026 |  | 37,883 | 200,202
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
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 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 |  |  |  |  |  |  | 6,327 |  |  |  |  |  |  | 32,322 |  |  |  |  |  |  | 38,649
Cash dividends declared on common stock |  |  |  |  |  |  | (386) |  |  |  |  |  |  | (2,176) |  |  |  |  |  |  |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,352)
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 182
Unrealized holding (losses) gains on marketable securities, net of taxes of $0 in all periods presented |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11)
Unrealized holding losses on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11)
Balance at Sep. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 224,022 | (28,983) | 214 | 1,034 | (349) | 40,095 | 236,033
Balance at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 192,143 | (17,034) | 214 | 1,037 | 0 | 38,996 | 215,356
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 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
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)
Unrealized holding (losses) gains on marketable securities, net of taxes of $0 in all periods presented |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (12) | 0 | 0 | 0 | 0 | (12)
Unrealized holding losses on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (12) | 0 | 0 | 0 | 0 | (12)
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,326 | (22,741) | 214 | 1,036 | (349) | 39,509 | 225,995
Net earnings |  |  |  |  |  |  | 2,715 |  |  |  |  |  |  | 13,833 | 16,548 | 0 | 0 | 0 | 0 | 0 | 16,548
Cash dividends declared on common stock | $ (128) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (128) | $ (724) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (724) |  |  |  |  |  |  |
Forfeiture of restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (2) | 0 |  | 0
Forfeiture of restricted common stock, APIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Foreign currency translation adjustment, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (8,372) | 0 | 0 | 0 | 0 | (8,372)
Unrealized gains on interest rate swap cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 2,070 | 0 | 0 | 0 | 0 | 2,070
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 584 | 584
Change in unfunded SERP liability, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 61 | 0 | 0 | 0 | 0 | 61
Unrealized holding (losses) gains on marketable securities, net of taxes of $0 in all periods presented |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1) | 0 | 0 | 0 | 0 | (1)
Repurchase of Class A common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 0
Unrealized holding losses on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1) | 0 | 0 | 0 | 0 | (1)
Balance at Sep. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 224,022 | $ (28,983) | $ 214 | $ 1,034 | $ (349) | $ 40,095 | $ 236,033

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