CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 72,631	$ 58,139
Cost of sales	34,231	33,727
Gross profit	38,400	24,412
Operating expenses:
Engineering, design and product development	9,442	8,570
Selling and marketing	9,934	11,326
General and administrative	13,318	12,193
Operating expenses	32,694	32,089
Operating income (loss)	5,706	(7,677)
Interest and other income (expense):
Interest expense	(310)	(208)
Interest income	55	0
Other, net	452	(16)
Interest and other income (expense)	197	(224)
Income (loss) before income taxes	5,903	(7,901)
Income tax (expense) benefit	(1,155)	1,965
Net income (loss)	$ 4,748	$ (5,936)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.48	$ (0.6)
Diluted (in dollars per share)	$ 0.47	$ (0.6)
Shares used in per-share calculation:
Basic (in shares)	9,951	9,905
Diluted (in shares)	10,021	9,905