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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 |  |  |  |

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