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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - 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, 2017 $ 3,457   $ 68,127 $ (1,980) $ 69,604
Balance (in shares) at Dec. 31, 2017 34,572        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 20 $ 496     516
Stock issued for stock incentive plans, net (in shares) 194        
Stock purchased and retired $ (20) (496) (2,419)   (2,935)
Stock purchased and retired (in shares) (200)        
Net income     7,609   7,609
Pension adjustment, net of taxes       19 19
Unrealized gain on securities, net of taxes and reclassification adjustment       7 7
Dividends paid     (3,465)   (3,465)
Balance at Mar. 31, 2018 $ 3,457   69,852 (1,954) 71,355
Balance (in shares) at Mar. 31, 2018 34,566        
Balance at Dec. 31, 2017 $ 3,457   68,127 (1,980) 69,604
Balance (in shares) at Dec. 31, 2017 34,572        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income         23,760
Pension adjustment, net of taxes         51
Unrealized gain on securities, net of taxes and reclassification adjustment         16
Balance at Sep. 30, 2018 $ 3,450   78,958 (1,913) 80,495
Balance (in shares) at Sep. 30, 2018 34,499        
Balance at Mar. 31, 2018 $ 3,457   69,852 (1,954) 71,355
Balance (in shares) at Mar. 31, 2018 34,566        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ (1) 529     528
Stock issued for stock incentive plans, net (in shares) (1)        
Stock purchased and retired $ (1) (529) 259   (271)
Stock purchased and retired (in shares) (17)        
Net income     8,990   8,990
Pension adjustment, net of taxes       15 15
Unrealized gain on securities, net of taxes and reclassification adjustment       9 9
Dividends paid     (3,455)   (3,455)
Balance at Jun. 30, 2018 $ 3,455   75,646 (1,930) 77,171
Balance (in shares) at Jun. 30, 2018 34,548        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 0 528     528
Stock issued for stock incentive plans, net (in shares) 0        
Stock purchased and retired $ (5) (528) (397)   (930)
Stock purchased and retired (in shares) (49)        
Net income     7,161   7,161
Pension adjustment, net of taxes       17 17
Dividends paid     (3,452)   (3,452)
Balance at Sep. 30, 2018 $ 3,450   78,958 (1,913) 80,495
Balance (in shares) at Sep. 30, 2018 34,499        
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 paid     (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         24,697
Pension adjustment, net of taxes         50
Unrealized gain on securities, net of taxes and reclassification adjustment         7
Balance at Sep. 30, 2019 $ 3,396   81,273 (2,532) 82,137
Balance (in shares) at Sep. 30, 2019 33,960        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of accounting standard (Note 2)     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 paid     (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]          
Stock issued for stock incentive plans, net   544     544
Stock purchased and retired $ (8) $ (544) (719)   (1,271)
Stock purchased and retired (in shares) (85)        
Net income     7,855   7,855
Pension adjustment, net of taxes       16 16
Dividends paid     (4,083)   (4,083)
Balance at Sep. 30, 2019 $ 3,396   $ 81,273 $ (2,532) 82,137
Balance (in shares) at Sep. 30, 2019 33,960        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of accounting standard (Note 2)         $ 414