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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Total
Balance at Dec. 31, 2019 $ 3,387   $ 76,573 $ (2,748) $ 77,212
Balance (in shares) at Dec. 31, 2019 33,870        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 18 $ 558     576
Stock issued for stock incentive plans, net (in shares) 175        
Stock purchased and retired $ (8) (558) (489)   (1,055)
Stock purchased and retired (in shares) (73)        
Net income     4,208   4,208
Pension adjustment, net of taxes       119 119
Dividends paid     (4,074)   (4,074)
Balance at Mar. 31, 2020 $ 3,397   76,218 (2,629) 76,986
Balance (in shares) at Mar. 31, 2020 33,972        
Balance at Dec. 31, 2019 $ 3,387   76,573 (2,748) 77,212
Balance (in shares) at Dec. 31, 2019 33,870        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income         12,450
Pension adjustment, net of taxes         157
Balance at Sep. 30, 2020 $ 3,387   79,679 (2,591) 80,475
Balance (in shares) at Sep. 30, 2020 33,869        
Balance at Mar. 31, 2020 $ 3,397   76,218 (2,629) 76,986
Balance (in shares) at Mar. 31, 2020 33,972        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net   581     581
Stock purchased and retired   (581) 552   (29)
Stock purchased and retired (in shares) (3)        
Net income     1,707   1,707
Pension adjustment, net of taxes       19 19
Dividends paid     (2,696)   (2,696)
Balance at Jun. 30, 2020 $ 3,397   75,781 (2,610) 76,568
Balance (in shares) at Jun. 30, 2020 33,969        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ (1) 1,501     1,500
Stock issued for stock incentive plans, net (in shares) (2)        
Stock purchased and retired $ (9) (1,501) 79   (1,431)
Stock purchased and retired (in shares) (98)        
Net income     6,535   6,535
Pension adjustment, net of taxes       19 19
Dividends paid     (2,716)   (2,716)
Balance at Sep. 30, 2020 $ 3,387   79,679 (2,591) 80,475
Balance (in shares) at Sep. 30, 2020 33,869        
Balance at Dec. 31, 2020 $ 3,387   83,079 (1,947) 84,519
Balance (in shares) at Dec. 31, 2020 33,869        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 18 535     553
Stock issued for stock incentive plans, net (in shares) 189        
Stock purchased and retired $ (6) (535) (509)   (1,050)
Stock purchased and retired (in shares) (64)        
Net income     8,097   8,097
Pension adjustment, net of taxes       14 14
Dividends paid     (3,398)   (3,398)
Balance at Mar. 31, 2021 $ 3,399   87,269 (1,933) 88,735
Balance (in shares) at Mar. 31, 2021 33,994        
Balance at Dec. 31, 2020 $ 3,387   83,079 (1,947) 84,519
Balance (in shares) at Dec. 31, 2020 33,869        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income         20,578
Pension adjustment, net of taxes         42
Balance at Sep. 30, 2021 $ 3,399   92,739 (1,905) 94,233
Balance (in shares) at Sep. 30, 2021 33,993        
Balance at Mar. 31, 2021 $ 3,399   87,269 (1,933) 88,735
Balance (in shares) at Mar. 31, 2021 33,994        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net   571     571
Stock purchased and retired   (571) 570   (1)
Net income     5,794   5,794
Pension adjustment, net of taxes       14 14
Dividends paid     (4,077)   (4,077)
Balance at Jun. 30, 2021 $ 3,399   89,556 (1,919) 91,036
Balance (in shares) at Jun. 30, 2021 33,994        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net   572     572
Stock issued for stock incentive plans, net (in shares) (1)        
Stock purchased and retired   $ (572) 572    
Net income     6,687   6,687
Pension adjustment, net of taxes       14 14
Dividends paid     (4,076)   (4,076)
Balance at Sep. 30, 2021 $ 3,399   $ 92,739 $ (1,905) $ 94,233
Balance (in shares) at Sep. 30, 2021 33,993