CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 17,190	$ 17,856	$ 59,366	$ 40,181
Cost of sales	8,274	9,663	27,337	23,988
Gross profit	8,916	8,193	32,029	16,193
Operating expenses:
Engineering, design and product development	2,509	1,985	7,283	6,440
Selling and marketing	2,397	2,748	7,838	8,724
General and administrative	2,819	3,073	10,680	9,200
Operating expenses	7,725	7,806	25,801	24,364
Operating income (loss)	1,191	387	6,228	(8,171)
Interest and other (expense) income:
Interest, net	(73)	(53)	(207)	(145)
Other, net	(43)	132	(22)	(167)
Interest and other (expense) income	(116)	79	(229)	(312)
Income (loss) before income taxes	1,075	466	5,999	(8,483)
Income tax (expense) benefit	(169)	62	(1,189)	2,287
Net income (loss)	$ 906	$ 528	$ 4,810	$ (6,196)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.09	$ 0.05	$ 0.48	$ (0.63)
Diluted (in dollars per share)	$ 0.09	$ 0.05	$ 0.48	$ (0.63)
Shares used in per-share calculation:
Basic (in shares)	9,958	9,911	9,948	9,902
Diluted (in shares)	10,052	9,911	10,023	9,902