CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 17,856	$ 10,637	$ 40,181	$ 28,263
Cost of sales	9,663	6,332	23,988	17,187
Gross profit	8,193	4,305	16,193	11,076
Operating expenses:
Engineering, design and product development	1,985	1,876	6,440	5,483
Selling and marketing	2,748	1,899	8,724	5,109
General and administrative	3,073	2,146	9,200	7,264
Operating expenses	7,806	5,921	24,364	17,856
Operating income (loss)	387	(1,616)	(8,171)	(6,780)
Interest and other income (expense):
Interest, net	(53)	(29)	(145)	(71)
Other, net	132	(69)	(167)	(169)
Gain on forgiveness of long-term debt	0	2,173	0	2,173
Interest and other income (expense)	79	2,075	(312)	1,933
Income (loss) before income taxes	466	459	(8,483)	(4,847)
Income tax benefit	62	442	2,287	1,629
Net income (loss)	$ 528	$ 901	$ (6,196)	$ (3,218)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.05	$ 0.1	$ (0.63)	$ (0.35)
Diluted (in dollars per share)	$ 0.05	$ 0.09	$ (0.63)	$ (0.35)
Shares used in per-share calculation:
Basic (in shares)	9,911	9,408	9,902	9,112
Diluted (in shares)	9,911	9,846	9,902	9,112