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Unaudited Condensed Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock
Class A Common Stock
Common Stock
Class B Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period at Dec. 31, 2019 $ 289,392 $ 5,397 $ 1,569 $ 8,911 $ 284,852 $ (11,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 465 88   377    
Purchase of treasury shares (1,002) (32)   (970)    
Net income 6,166       6,166  
Cash dividends on Class A and Class B common stock (1,339)       (1,339)  
Reclassification adjustment to net income, net of tax 155         155
Balance, end of period at Mar. 31, 2020 293,837 5,453 1,569 8,318 289,679 (11,182)
Balance, beginning of period at Dec. 31, 2020 300,624 5,490 1,568 10,895 294,270 (11,599)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 1,015 92   923    
Conversion of Class B to Class A shares 0 1 (1)      
Net income 8,961       8,961  
Cash dividends on Class A and Class B common stock (1,374)       (1,374)  
Reclassification adjustment to net income, net of tax 143         143
Balance, end of period at Mar. 31, 2021 $ 309,369 $ 5,583 $ 1,567 $ 11,818 $ 301,857 $ (11,456)