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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