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Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Equity                
Balance at beginning     $ 245,585       $ 245,585  
Net earnings $ 6,586     $ 8,063     14,385 $ 20,320
Foreign currency translation adjustments (2)     913     2,014 (118)
Pension liability adjustments       $ 79     82 $ 225
Balance at ending $ 251,327           $ 251,327  
Cash dividends declared (in dollars per share) $ 0.27 $ 0.27 $ 0.26 $ 0.26 $ 0.26 $ 0.25 $ 0.8 $ 0.77
Common Stock                
Equity                
Balance at beginning $ 9,539 $ 9,619 $ 9,643 $ 9,491 $ 9,508 $ 9,497 $ 9,643 $ 9,497
Stock options exercised, net of shares withheld for employee taxes and strike price 1   1 15 1 11    
Issuance of restricted stock 65     55        
Net share settlement of restricted stock (7)              
Restricted stock forfeited (1)              
Shares purchased and retired (31) (80) (25) (2) (18)      
Balance at ending 9,566 9,539 9,619 9,559 9,491 9,508 9,566 9,559
Capital in Excess of Par Value                
Equity                
Balance at beginning 73,378 73,003 72,577 72,346 72,016 71,661 72,577 71,661
Stock options exercised, net of shares withheld for employee taxes and strike price (2)   (1) (18) (1) (12)    
Issuance of restricted stock (65)     (55)        
Net share settlement of restricted stock (221)              
Restricted stock forfeited 1              
Share-based compensation expense 444 375 427 388 331 367    
Balance at ending 73,535 73,378 73,003 72,661 72,346 72,016 73,535 72,661
Reinvested Earnings                
Equity                
Balance at beginning 180,981 183,629 181,299 187,563 184,914 180,646 181,299 180,646
Net earnings 6,586 2,256 5,543 8,063 5,607 6,650    
Cash dividends declared (2,571) (2,581) (2,506) (2,468) (2,467) (2,377)    
Shares purchased and retired (932) (2,323) (707) (51) (491) (5)    
Balance at ending 184,064 180,981 183,629 193,107 187,563 184,914 184,064 193,107
Accumulated other comprehensive loss                
Equity                
Balance at beginning (15,836) (17,701) (17,934) (18,196) (18,330) (17,311) (17,934) (17,311)
Foreign currency translation adjustments (2) 1,824 192 913 61 (1,092)    
Pension liability adjustments   41 41 79 73 73    
Balance at ending $ (15,838) $ (15,836) $ (17,701) $ (17,204) $ (18,196) $ (18,330) $ (15,838) $ (17,204)