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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net sales $ 536,986 $ 526,697 $ 376,701
Costs and expenses:      
Cost of goods sold 350,972 337,932 247,772
Selling and administrative expenses 142,060 136,515 107,282
Other periodic pension costs 1,786 955 1,962
Pension plan termination charge 7,821 0 0
Interest expense 1,220 2,003 4,399
Costs and Expenses, Excluding Gain on Sale of Property Plant and Equipment 503,859 477,405 361,415
Gain on sale of property, plant and equipment 0 2,164 0
Income before taxes on income 33,127 51,456 15,286
Income tax expense 3,687 10,430 3,220
Net income $ 29,440 $ 41,026 $ 12,066
Net income per share:      
Net income per share, basic (in dollars per share) $ 1.91 $ 2.72 $ 0.81
Net income per share, diluted (in dollars per share) $ 1.83 $ 2.65 $ 0.79
Weighted average shares outstanding during the period      
Weighted average number of shares outstanding during the period, basic (in shares) 15,438,849 15,075,134 14,945,165
Weighted average number of shares outstanding during the period, diluted (in shares) 16,091,070 15,508,420 15,266,408
Other comprehensive income (loss), net of tax:      
Recognition of net losses included in net periodic pension costs $ 1,662 $ 940 $ 968
Recognition of settlement loss included in net periodic pension costs 0 314 835
Recognition of net losses included in pension plan termination charges 5,230 0 0
Current period loss (571) (4,928) (1,354)
Loss on cash flow hedging activities (23) (22) (22)
Foreign currency translation adjustment (310) (1,021) 74
Other comprehensive income (loss) 5,988 (4,717) 501
Comprehensive income $ 35,428 $ 36,309 $ 12,567
Cash dividends per common share (in dollars per share) $ 0.46 $ 0.40 $ 0.40