CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 65,438	$ 43,203	$ 121,096	$ 116,766
Cost of products sold	48,467	36,599	91,212	85,696
Gross profit	16,971	6,604	29,884	31,070
Costs and expenses:
General and administrative expenses	8,471	6,707	16,400	14,831
Selling and distribution expenses	5,544	5,488	10,787	14,015
Amortization of purchased intangible assets	288	353	612	707
Restructuring expenses and asset impairments	0	2,046	127	3,162
Total costs and expenses	14,303	14,594	27,926	32,715
Operating income (loss)	2,668	(7,990)	1,958	(1,645)
Other income (expense):
Other income (expense), net	108	(85)	502	32
Interest expense, net	(81)	(156)	(216)	(394)
Income (loss) before income taxes	2,695	(8,231)	2,244	(2,007)
Income tax provision (benefit)	971	(2,583)	88	(514)
Net income (loss)	$ 1,724	$ (5,648)	$ 2,156	$ (1,493)
Net income (loss) per share
Basic (in dollars per share)	$ 0.10	$ (0.38)	$ 0.13	$ (0.10)
Diluted (in dollars per share)	$ 0.10	$ (0.38)	$ 0.13	$ (0.10)
Weighted average shares outstanding:
Basic (in shares)	17,554,809	14,832,242	16,495,685	14,745,661
Diluted (in shares)	17,568,444	14,832,242	16,507,500	14,745,661
Dividends declared per common share (in dollars per share)	$ 0	$ 0	$ 0	$ 0.125