CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)
Net sales	$ 7,212	$ 6,730	$ 16,946	$ 19,478
Cost of goods sold	3,101	2,642	7,774	8,215
Gross margin	4,111	4,088	9,172	11,263
Operating expenses:
Research and development	1,432	1,730	4,605	5,009
Selling, general and administrative	1,967	2,216	5,943	6,332
Total operating expenses	3,399	3,946	10,548	11,341
Operating income (loss)	712	142	(1,376)	(78)
Non-operating income (loss):
Interest income	9	8	11	11
Gain on sale of assets	0	0	57	0
Foreign currency transaction gain (loss)	307	(26)	378	(64)
Total non-operating income (loss)	316	(18)	446	(53)
Income (loss) before income taxes	1,028	124	(930)	(131)
Income tax (expense) benefit	181	112	700	219
Net income (loss)	$ 847	$ 12	$ (1,630)	$ (350)
Basic earnings (loss) per share	$ 0.10	$ 0.00	$ (0.19)	$ (0.04)
Diluted earnings (loss) per share	$ 0.10	$ 0.00	$ (0.19)	$ (0.04)
Weighted-average basic shares	8,816	8,621	8,715	8,519
Weighted-average diluted shares	8,859	8,760	8,715	8,519