Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]
Net sales	$ 18,566	$ 9,146	$ 39,960	$ 26,291
Cost of sales	7,285	3,903	16,493	11,182
Gross profit	11,281	5,243	23,467	15,109
Operating expenses	10,557	7,580	21,778	18,676
Impairment expense	0	9	0	1,078
Income (loss) from operations	724	(2,346)	1,689	(4,645)
Other (income) expense:
Interest expense	5	0	10	0
Other, net	22	(51)	14	(104)
Total other (income) expense	27	(51)	24	(104)
Income (loss) before income taxes	697	(2,295)	1,665	(4,541)
Provision (benefit) for income taxes	157	(520)	380	(1,028)
Net income (loss)	540	(1,775)	1,285	(3,513)
Foreign currency translation adjustments, net of tax	69	130	36	(216)
Comprehensive income (loss)	$ 609	$ (1,645)	$ 1,321	$ (3,729)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.06	$ (0.20)	$ 0.15	$ (0.39)
Diluted (in dollars per share)	$ 0.06	$ (0.20)	$ 0.15	$ (0.39)
Weighted average number of shares outstanding:
Basic (in shares)	8,664,768	9,042,991	8,737,854	9,036,101
Diluted (in shares)	8,670,093	9,042,991	8,740,116	9,036,101