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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 loss on securities, net of taxes and reclassification adjustments       7 7
Dividends declared     (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         16,599
Pension adjustment, net of taxes         34
Unrealized loss on securities, net of taxes and reclassification adjustments         16
Balance at Jun. 30, 2018 $ 3,455   75,646 (1,930) 77,171
Balance (in shares) at Jun. 30, 2018 34,548        
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 loss on securities, net of taxes and reclassification adjustments       9 9
Dividends declared     (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        
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 loss on securities, net of taxes and reclassification adjustments       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 loss on securities, net of taxes and reclassification adjustments         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 (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 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 (Note 2)         $ 414