CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 12,623	$ 9,325	$ 22,325	$ 17,626
Cost of sales	7,189	5,893	14,325	10,855
Gross profit	5,434	3,432	8,000	6,771
Operating expenses:
Engineering, design and product development	2,172	1,804	4,455	3,607
Selling and marketing	3,293	1,767	5,976	3,210
General and administrative	2,923	2,509	6,127	5,118
Operating expenses	8,388	6,080	16,558	11,935
Operating loss	(2,954)	(2,648)	(8,558)	(5,164)
Interest and other expense:
Interest, net	(28)	(29)	(92)	(42)
Other, net	(264)	(17)	(299)	(100)
Interest and other expense	(292)	(46)	(391)	(142)
Loss before income taxes	(3,246)	(2,694)	(8,949)	(5,306)
Income tax benefit	870	664	2,225	1,187
Net loss	$ (2,376)	$ (2,030)	$ (6,724)	$ (4,119)
Net loss per common share:
Basic (in dollars per share)	$ (0.24)	$ (0.23)	$ (0.68)	$ (0.46)
Diluted (in dollars per share)	$ (0.24)	$ (0.23)	$ (0.68)	$ (0.46)
Shares used in per-share calculation:
Basic (in shares)	9,910	8,976	9,898	8,962
Diluted (in shares)	9,910	8,976	9,898	8,962