Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net sales	$ 18,410	$ 18,566	$ 38,910	$ 39,960
Cost of sales	7,909	7,285	16,478	16,493
Gross profit	10,501	11,281	22,432	23,467
Operating expenses	11,238	10,557	22,339	21,778
Income (loss) from operations	(737)	724	93	1,689
Other expense:
Interest expense	8	5	11	10
Other, net	22	22	6	14
Total other expense	30	27	17	24
Income (loss) before income taxes	(767)	697	76	1,665
Provision (benefit) for income taxes	(178)	157	20	380
Net income (loss)	(589)	540	56	1,285
Foreign currency translation adjustments, net of tax	(253)	69	(188)	36
Comprehensive income (loss)	$ (842)	$ 609	$ (132)	$ 1,321
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.07)	$ 0.06	$ 0.01	$ 0.15
Diluted (in dollars per share)	$ (0.07)	$ 0.06	$ 0.01	$ 0.15
Weighted average number of shares outstanding:
Basic (in shares)	8,279,108	8,664,768	8,426,181	8,737,854
Diluted (in shares)	8,279,108	8,670,093	8,432,897	8,740,116