CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 19,906	$ 12,623	$ 42,176	$ 22,325
Cost of sales	9,048	7,189	19,063	14,325
Gross profit	10,858	5,434	23,113	8,000
Operating expenses:
Engineering, design and product development	2,505	2,172	4,774	4,455
Selling and marketing	2,684	3,293	5,441	5,976
General and administrative	4,445	2,923	7,861	6,127
Operating expenses	9,634	8,388	18,076	16,558
Operating income (loss)	1,224	(2,954)	5,037	(8,558)
Interest and other income (expense):
Interest, net	(68)	(28)	(134)	(92)
Other, net	0	(264)	21	(299)
Interest and other (expense) income	(68)	(292)	(113)	(391)
Income (loss) before income taxes	1,156	(3,246)	4,924	(8,949)
Income tax (expense) benefit	(391)	870	(1,020)	2,225
Net income (loss)	$ 765	$ (2,376)	$ 3,904	$ (6,724)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.08	$ (0.24)	$ 0.39	$ (0.68)
Diluted (in dollars per share)	$ 0.08	$ (0.24)	$ 0.39	$ (0.68)
Shares used in per-share calculation:
Basic (in shares)	9,956	9,910	9,943	9,898
Diluted (in shares)	10,017	9,910	10,016	9,898