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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                             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                             0 0 $ 0 $ (1) 0   0
Foreign currency translation adjustment, net of taxes                             0 1,998 0 0 0 0 1,998
Unrealized holding gains on interest rate swap cash flow hedge, net of taxes                             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
Net earnings                             14,572 0 0 0 0 0 14,572
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                                       (1)  
Forfeiture of restricted common stock                                       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 (in shares) at Mar. 31, 2023                                 2,142 10,633      
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             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
Net earnings             6,790             35,557             42,347
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 (in shares) at Jun. 30, 2023                                 2,142 10,638      
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      
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)              
Issuance of restricted common stock                             0 0 $ 0 $ 1 0 (1) 0
Issuance of restricted common stock (in shares)                                 0 10      
Forfeiture of restricted common stock                             0 0 $ 0 $ (3) 0   0
Forfeiture of restricted common stock (in shares)                                 0 (5)      
Forfeiture of restricted common stock                             0 0 $ 0 $ (3) 0   0
Foreign currency translation adjustment, net of taxes                             0 (2,231) 0 0 0 0 (2,231)
Unrealized holding gains on interest rate swap cash flow hedge, net of taxes                             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
Net earnings             4,458             23,317 27,775 0 0 0 0 0 27,775
Forfeiture of restricted common stock                             (0) (0) $ (0) $ 3 (0)   (0)
Forfeiture of restricted common stock (in shares)                                 0 (5)      
Forfeiture of restricted common stock                                       (3)  
Forfeiture of restricted common stock                                       3  
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
Balance at Jun. 30, 2023                             277,790 (16,856) $ 214 $ 1,064 (349) 42,627 304,490
Balance (in shares) at Jun. 30, 2023                                 2,142 10,638      
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                             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 0  
Forfeiture of restricted common stock                             0 0 $ 0 $ (6)     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                             0 (3,776) $ 0 $ 0 0 0 (3,776)
Unrealized holding gains on interest rate swap cash flow hedge, net of taxes                             0 340 0 0 0 0 340
Unrealized holding gains on marketable securities, net of taxes                             0 1 0 0 0 0 1
Stock-based compensation expense                             0 0 0 0 0 804 804
Change in unfunded SERP liability, net of taxes                             0 15 0 0 0 0 15
Net earnings                             15,874 0 0 0 $ 0 $ 0 15,874
Forfeiture of restricted common stock                             (0) (0) $ (0) $ 6     (0)
Forfeiture of restricted common stock (in shares)                                 0 0 0 0  
Purchases of common stock (in shares)                                 11 98      
Stock-based compensation expense                             0 0 $ 0 $ 0 $ 0 $ 804 804
Change in unfunded SERP liability, net of taxes                             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      
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             5,573             29,107             34,680
Cash dividends declared on common stock             (256)             (1,472)              
Foreign currency translation adjustment, net of taxes                                         (4,775)
Unrealized holding gains on marketable securities, net of taxes                                         1
Change in unfunded SERP liability, net of taxes                                         30
Net earnings             5,573             29,107             34,680
Change in unfunded SERP liability, net of taxes                                         30
Balance at Jun. 30, 2024                             340,462 (16,732) $ 212 $ 1,048 (14,629) 46,054 356,415
Balance (in shares) at Jun. 30, 2024                                 2,121 10,453      
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      
Net earnings             3,028             15,778 18,806 0 $ 0 $ 0 0 0 18,806
Cash dividends declared on common stock $ (127) $ 0 $ 0 $ 0 $ 0 $ 0 (127) $ (725) $ 0 $ 0 $ 0 $ 0 $ 0 (725)              
Forfeiture of restricted common stock                             0 0 $ 0 $ (1) 0   (1)
Forfeiture of restricted common stock (in shares)                                 0 (4)      
Forfeiture of restricted common stock                             0 0 $ 0 $ (1) 0   (1)
Purchases of common stock                             0 0 $ (1) $ (12) (7,892)   (7,893)
Purchases of common stock (in shares)                                 (10) 117      
Purchases of common stock                                       12  
Foreign currency translation adjustment, net of taxes                             0 (999) $ 0 $ 0 0 0 (999)
Unrealized holding gains on interest rate swap cash flow hedge, net of taxes                             0 (291) 0 0 0 0 (291)
Unrealized holding gains on marketable securities, net of taxes                                         0
Stock-based compensation expense                             0 0 0 0 0 971 971
Change in unfunded SERP liability, net of taxes                             0 15 0 0 0 0 15
Net earnings             $ 3,028             $ 15,778 18,806 0 0 0 0 0 18,806
Forfeiture of restricted common stock                             (0) (0) $ (0) $ 1 (0)   1
Forfeiture of restricted common stock (in shares)                                 0 (4)      
Forfeiture of restricted common stock                                       2  
Purchases of common stock (in shares)                                 10 (117)      
Forfeiture of restricted common stock                                       (2)  
Stock-based compensation expense                             0 0 $ 0 $ 0 0 971 971
Change in unfunded SERP liability, net of taxes                             0 15 0 0 0 0 15
Balance at Jun. 30, 2024                             $ 340,462 $ (16,732) $ 212 $ 1,048 $ (14,629) $ 46,054 $ 356,415
Balance (in shares) at Jun. 30, 2024                                 2,121 10,453