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Consolidated Statements of Changes in Stockholders' Equity (Deficit) (unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Voting [Member]
Common Stock [Member]
Non-Voting [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Total
Beginning balance at Dec. 31, 2017 $ 192 $ 0 $ 103,640 $ (2,973) $ (47,535) $ 53,324
Beginning balance (in shares) at Dec. 31, 2017 19,210,633          
Unrecognized pension and postretirement cost adjustment, net of tax $ 0 0 0 304 0 304
Unrealized gain (loss) on MSA investments, net of tax 0 0 0 (504) 0 (504)
Unrealized loss on other investments, net of tax 0 0 0 (3) 0 (3)
Unrealized loss on interest rate swaps, net of tax 0 0 0 (75) 0 (75)
Stock compensation expense 0 0 651 0 0 651
Restricted stock forfeitures $ 0 0 (6) 0 0 (6)
Restricted stock forfeitures (in shares) (2,762)          
Exercise of options $ 1 0 607 0 0 608
Exercise of options (in shares) 104,849          
Dividends $ 0 0 0 0 (1,557) (1,557)
Reclassification of tax effects from accumulated other comprehensive income 0 0 0 24 (24) 0
Net income 0 0 0 0 12,351 12,351
Ending balance at Jun. 30, 2018 $ 193 0 104,892 (3,227) (36,765) 65,093
Ending balance (in shares) at Jun. 30, 2018 19,312,720          
Beginning balance at Dec. 31, 2017 $ 192 0 103,640 (2,973) (47,535) 53,324
Beginning balance (in shares) at Dec. 31, 2017 19,210,633          
Ending balance at Dec. 31, 2018 $ 196 0 110,466 (2,536) (25,503) 82,623
Ending balance (in shares) at Dec. 31, 2018 19,553,857          
Beginning balance at Mar. 31, 2018 $ 192 0 103,833 (3,829) (45,304) 54,892
Beginning balance (in shares) at Mar. 31, 2018 19,222,617          
Unrecognized pension and postretirement cost adjustment, net of tax $ 0 0 0 274 0 274
Unrealized gain (loss) on MSA investments, net of tax 0 0 0 (125) 0 (125)
Unrealized loss on other investments, net of tax 0 0 0 2 0 2
Unrealized loss on interest rate swaps, net of tax 0 0 0 451 0 451
Stock compensation expense 0 0 474 0 0 474
Restricted stock forfeitures $ 0 0 (1) 0 0 (1)
Restricted stock forfeitures (in shares) (2,245)          
Exercise of options $ 1 0 586 0 0 587
Exercise of options (in shares) 92,348          
Dividends $ 0 0 0 0 (780) (780)
Net income 0 0 0 0 9,319 9,319
Ending balance at Jun. 30, 2018 $ 193 0 104,892 (3,227) (36,765) 65,093
Ending balance (in shares) at Jun. 30, 2018 19,312,720          
Beginning balance at Dec. 31, 2018 $ 196 0 110,466 (2,536) (25,503) 82,623
Beginning balance (in shares) at Dec. 31, 2018 19,553,857          
Unrecognized pension and postretirement cost adjustment, net of tax $ 0 0 0 (8) 0 (8)
Unrealized gain (loss) on MSA investments, net of tax 0 0 0 911 0 911
Unrealized loss on interest rate swaps, net of tax 0 0 0 (1,407) 0 (1,407)
Stock compensation expense 0 0 1,387 0 0 1,387
Restricted stock forfeitures $ 0 0 (84) 0 0 (84)
Restricted stock forfeitures (in shares) (1,947)          
Exercise of options $ 1 0 609 0 0 610
Exercise of options (in shares) 106,036          
Redemption of options $ 0 0 (12) 0 0 (12)
Dividends 0 0 0 0 (1,784) (1,784)
Net income 0 0 0 0 19,765 19,765
Ending balance at Jun. 30, 2019 $ 197 0 112,366 (3,040) (7,522) 102,001
Ending balance (in shares) at Jun. 30, 2019 19,657,946          
Beginning balance at Mar. 31, 2019 $ 196 0 111,089 (2,614) (19,830) 88,841
Beginning balance (in shares) at Mar. 31, 2019 19,576,398          
Unrecognized pension and postretirement cost adjustment, net of tax $ 0 0 0 (4) 0 (4)
Unrealized gain (loss) on MSA investments, net of tax 0 0 0 509 0 509
Unrealized loss on interest rate swaps, net of tax 0 0 0 (931) 0 (931)
Stock compensation expense 0 0 938 0 0 938
Restricted stock forfeitures $ 0 0 (83) 0 0 (83)
Restricted stock forfeitures (in shares) (1,900)          
Exercise of options $ 1 0 422 0 0 423
Exercise of options (in shares) 83,448          
Dividends $ 0 0 0 0 (897) (897)
Net income 0 0 0 0 13,205 13,205
Ending balance at Jun. 30, 2019 $ 197 $ 0 $ 112,366 $ (3,040) $ (7,522) $ 102,001
Ending balance (in shares) at Jun. 30, 2019 19,657,946