Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net sales	$ 127,737	$ 89,466	$ 381,341	$ 268,288
Costs and expenses:
Cost of goods sold	80,285	58,015	244,500	174,226
Selling and administrative expenses	34,917	25,260	98,704	78,008
Other periodic pension costs	212	476	830	1,282
Interest expense	239	1,085	1,732	3,514
Costs and Expenses, Excluding Gain on Sale of Property Plant and Equipment	115,653	84,836	345,766	257,030
Income before taxes on income	12,084	4,630	35,575	11,258
Income tax expense	2,140	709	7,090	2,180
Net income	$ 9,944	$ 3,921	$ 28,485	$ 9,078
Net income per share:
Net income per share, basic (in dollars per share)	$ 0.66	$ 0.26	$ 1.89	$ 0.61
Net income per share, diluted (in dollars per share)	$ 0.63	$ 0.26	$ 1.85	$ 0.59
Weighted average shares outstanding during the period:
Weighted average number of shares outstanding during the period, basic (in shares)	15,084,300	14,947,552	15,041,738	14,942,565
Weighted average number of shares outstanding during the period, diluted (in shares)	15,711,122	15,266,850	15,361,035	15,272,287
Other comprehensive income (loss), net of tax:
Recognition of net losses included in net periodic pension costs	$ 232	$ 236	$ 712	$ 739
Recognition of settlement loss included in net periodic pension costs	62	213	314	459
Loss on cash flow hedging activities	(5)	(5)	(16)	(16)
Foreign currency translation adjustment	(145)	(316)	(1,546)	(295)
Other comprehensive income	144	128	(536)	887
Comprehensive income	$ 10,088	$ 4,049	$ 27,949	$ 9,965
Cash dividends per common share (in dollars per share)	$ 0.20	$ 0.10	$ 0.30	$ 0.30
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 127,737	$ 89,466	$ 381,341	$ 268,288