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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, 2018 $ 3,433   $ 73,954 $ (2,175) $ 75,212
Balance (in shares) at Dec. 31, 2018 34,328        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 14 $ 524     538
Stock issued for stock incentive plans, net (in shares) 141        
Stock purchased and retired $ (34) (524) (4,338)   (4,896)
Stock purchased and retired (in shares) (344)        
Net income     7,469   7,469
Pension adjustment, net of taxes       17 17
Unrealized gain on securities, net of taxes and reclassification adjustment       7 7
Dividends declared     (4,117)   (4,117)
Balance at Mar. 31, 2019 $ 3,413   73,382 (2,565) 74,230
Balance (in shares) at Mar. 31, 2019 34,125        
Balance at Dec. 31, 2018 $ 3,433   73,954 (2,175) 75,212
Balance (in shares) at Dec. 31, 2018 34,328        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income         16,842
Pension adjustment, net of taxes         34
Unrealized gain on securities, net of taxes and reclassification adjustment         7
Balance at Jun. 30, 2019 $ 3,404   78,220 (2,548) 79,076
Balance (in shares) at Jun. 30, 2019 34,045        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of accounting standard     414 (414)  
Balance at Mar. 31, 2019 $ 3,413   73,382 (2,565) 74,230
Balance (in shares) at Mar. 31, 2019 34,125        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ (1) 545     544
Stock issued for stock incentive plans, net (in shares) (11)        
Stock purchased and retired $ (8) (545) (443)   (996)
Stock purchased and retired (in shares) (69)        
Net income     9,373   9,373
Pension adjustment, net of taxes       17 17
Dividends declared     (4,092)   (4,092)
Balance at Jun. 30, 2019 $ 3,404   78,220 (2,548) 79,076
Balance (in shares) at Jun. 30, 2019 34,045        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of accounting standard         414
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 declared     (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         5,915
Pension adjustment, net of taxes         138
Balance at Jun. 30, 2020 $ 3,397   75,781 (2,610) 76,568
Balance (in shares) at Jun. 30, 2020 33,969        
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 declared     (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