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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Equity            
Balance at beginning   $ 223,905     $ 223,905  
Net earnings $ 4,864   $ 4,495   12,309 $ 8,548
Foreign currency translation adjustments 262   (1,235)   (44) (714)
Pension liability adjustment, net of tax         183 324
Balance at ending 230,079       230,079  
Common stock            
Equity            
Balance at beginning 9,523 9,584 9,634 $ 9,709 9,584 9,709
Net earnings 0 0 0 0    
Foreign currency translation adjustments 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0    
Cash dividends declared 0 0 0 0    
Stock options exercised, net of shares withheld for employee taxes and strike price 29 1 15 0    
Share-based compensation expense 0 0 0 0    
Shares purchased and retired (23) (62) (29) (75)    
Balance at ending 9,529 9,523 9,620 9,634 9,529 9,620
Capital in excess of par value            
Equity            
Balance at beginning 70,828 70,475 69,076 68,718 70,475 68,718
Net earnings 0 0 0 0    
Foreign currency translation adjustments 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0    
Cash dividends declared 0 0 0 0    
Stock options exercised, net of shares withheld for employee taxes and strike price (194) 15 193 8    
Share-based compensation expense 337 338 468 350    
Shares purchased and retired 0 0 0 0    
Balance at ending 70,971 70,828 69,737 69,076 70,971 69,737
Reinvested earnings            
Equity            
Balance at beginning 167,717 164,039 147,777 147,762 164,039 147,762
Net earnings 4,864 7,445 4,495 4,053    
Foreign currency translation adjustments 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0    
Cash dividends declared (2,377) (2,289) (2,307) (2,316)    
Stock options exercised, net of shares withheld for employee taxes and strike price 0 0 0 0    
Share-based compensation expense 0 0 0 0    
Shares purchased and retired (571) (1,478) (701) (1,722)    
Balance at ending 169,633 167,717 149,264 147,777 169,633 149,264
Accumulated other comprehensive loss            
Equity            
Balance at beginning (20,400) (20,193) (24,119) (24,794) (20,193) (24,794)
Net earnings     0 0    
Foreign currency translation adjustments 262 (306) (1,235) 521    
Pension liability adjustment, net of tax 84 (99) 170 (154)    
Cash dividends declared     0 0    
Stock options exercised, net of shares withheld for employee taxes and strike price     0 0    
Share-based compensation expense     0 0    
Shares purchased and retired     0 0    
Balance at ending $ (20,054) $ (20,400) $ (25,184) $ (24,119) $ (20,054) $ (25,184)