CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) [Abstract]
Net sales	$ 7,300	$ 11,686	$ 22,832	$ 34,586
Cost of sales	3,951	6,140	12,275	17,250
Gross profit	3,349	5,546	10,557	17,336
Operating expenses:
Engineering, design and product development	1,445	1,048	4,197	3,328
Selling and marketing	1,258	1,947	4,885	5,890
General and administrative	2,125	2,239	6,987	6,720
Operating expenses	4,828	5,234	16,069	15,938
Operating (loss) income	(1,479)	312	(5,512)	1,398
Interest and other expense:
Interest, net	(19)	0	(41)	(13)
Other, net	116	(71)	(60)	(123)
Interest and other expense	97	(71)	(101)	(136)
(Loss) income before income taxes	(1,382)	241	(5,613)	1,262
Income tax benefit	(515)	(143)	(1,901)	(54)
Net (loss) income	$ (867)	$ 384	$ (3,712)	$ 1,316
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.11)	$ 0.05	$ (0.49)	$ 0.18
Diluted (in dollars per share)	$ (0.11)	$ 0.05	$ (0.49)	$ 0.17
Shares used in per-share calculation:
Basic (in shares)	7,548	7,470	7,533	7,464
Diluted (in shares)	7,548	7,753	7,533	7,658