Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 526,697	$ 376,701	$ 346,350
Costs and expenses:
Cost of goods sold	337,932	247,772	224,653
Selling and administrative expenses	136,515	107,282	96,710
Other periodic pension costs	955	1,962	385
Interest expense	2,003	4,399	3,207
Costs and Expenses, Excluding Gain on Sale of Property Plant and Equipment	477,405	361,415	324,955
Gain on sale of property, plant and equipment	2,164	0	0
Income before taxes on income	51,456	15,286	21,395
Income tax expense	10,430	3,220	4,420
Net income	$ 41,026	$ 12,066	$ 16,975
Net income per share:
Net income per share, basic (in dollars per share)	$ 2.72	$ 0.81	$ 1.14
Net income per share, diluted (in dollars per share)	$ 2.65	$ 0.79	$ 1.10
Weighted average shares outstanding during the period
Weighted average number of shares outstanding during the period, basic (in shares)	15,075,134	14,945,165	14,937,786
Weighted average number of shares outstanding during the period, diluted (in shares)	15,508,420	15,266,408	15,472,133
Other comprehensive income (loss), net of tax:
Recognition of net losses included in net periodic pension costs	$ 940	$ 968	$ 862
Recognition of settlement loss included in net periodic pension costs	314	835	0
Current period loss	(4,928)	(1,354)	(1,253)
Gain (loss) on cash flow hedging activities	(22)	(22)	203
Foreign currency translation adjustment	(1,021)	74	(518)
Other comprehensive income (loss)	(4,717)	501	(706)
Comprehensive income	$ 36,309	$ 12,567	$ 16,269
Cash dividends per common share (in dollars per share)	$ 400	$ 400	$ 390