CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 22,270	$ 9,702
Cost of sales	10,015	7,136
Gross profit	12,255	2,566
Operating expenses:
Engineering, design and product development	2,269	2,283
Selling and marketing	2,757	2,683
General and administrative	3,416	3,204
Operating expenses	8,442	8,170
Operating income (loss)	3,813	(5,604)
Interest and other (expense) income:
Interest, net	(66)	(64)
Other, net	21	(35)
Interest and other (expense) income	(45)	(99)
Income (loss) before income taxes	3,768	(5,703)
Income tax expense (benefit)	629	(1,355)
Net income (loss)	$ 3,139	$ (4,348)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.32	$ (0.44)
Diluted (in dollars per share)	$ 0.31	$ (0.44)
Shares used in per-share calculations:
Basic (in shares)	9,930	9,886
Diluted (in shares)	10,043	9,886