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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Balance   $ 201,395     $ 201,395  
Net earnings $ 4,495   $ 3,820   8,548 $ 5,145
Foreign currency translation adjustments (1,235)   176   (714) 33
Pension liability adjustment, net of tax         324 365
Balance 203,437       203,437  
Common Stock            
Balance 9,634 9,709 9,735 $ 9,797 9,709 9,797
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 option exercised, net of shares withheld for emloyee taxes and strike price 15 0        
Share-based compensation expense 0 0 0 0    
Shares purchased and retired (29) (75) (21) (62)    
Balance 9,620 9,634 9,714 9,735 9,620 9,714
Capital in Excess of Par Value            
Balance 69,076 68,718 67,723 67,178 68,718 67,178
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 option exercised, net of shares withheld for emloyee taxes and strike price 193 8        
Share-based compensation expense 468 350 327 545    
Shares purchased and retired 0 0 0 0    
Balance 69,737 69,076 68,050 67,723 69,737 68,050
Reinvested Earnings            
Balance 147,777 147,762 136,927 138,955 147,762 138,955
Net earnings 4,495 4,053 3,820 1,325    
Foreign currency translation adjustments 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0    
Cash dividends declared (2,307) (2,316) (2,334) (2,336)    
Stock option exercised, net of shares withheld for emloyee taxes and strike price 0 0        
Share-based compensation expense 0 0 0 0    
Shares purchased and retired (701) (1,722) (435) (1,017)    
Balance 149,264 147,777 137,978 136,927 149,264 137,978
Accumulated Other Comprehensive Loss            
Balance (24,119) (24,794) (27,965) (28,005) (24,794) (28,005)
Net earnings 0 0 0 0    
Foreign currency translation adjustments (1,235) 521 176 (143)    
Pension liability adjustment, net of tax 170 154 182 183    
Cash dividends declared 0 0 0 0    
Stock option exercised, net of shares withheld for emloyee taxes and strike price 0 0        
Share-based compensation expense 0 0 0 0    
Shares purchased and retired 0 0 0 0    
Balance $ (25,184) $ (24,119) $ (27,607) $ (27,965) $ (25,184) $ (27,607)