CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 10,687	$ 22,270
Cost of sales	5,063	10,015
Gross profit	5,624	12,255
Operating expenses:
Engineering, design and product development	1,966	2,269
Selling and marketing	2,083	2,757
General and administrative	2,876	3,416
Operating expenses	6,925	8,442
Operating (loss) income	(1,301)	3,813
Interest and other (expense) income:
Interest, net	48	(66)
Other, net	(60)	21
Interest and other income (expense)	(12)	(45)
(Loss) income before income taxes	(1,313)	3,768
Income tax (benefit) expense	(277)	629
Net (loss) income	$ (1,036)	$ 3,139
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.1)	$ 0.32
Diluted (in dollars per share)	$ (0.1)	$ 0.31
Shares used in per-share calculations:
Basic (in shares)	9,972	9,930
Diluted (in shares)	9,972	10,043