CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 7,398	$ 4,769	$ 14,629	$ 9,734
Cost of goods sold	3,025	2,011	5,954	4,673
Gross margin	4,373	2,758	8,675	5,061
Operating expenses:
Research and development	1,720	1,557	3,345	3,173
Selling, general and administrative	2,489	1,928	4,997	3,976
Total operating expenses	4,209	3,485	8,342	7,149
Operating income (loss)	164	(727)	333	(2,088)
Non-operating income (loss):
Interest income	49	1	84	2
Gain on sale of assets	0	0	0	57
Foreign currency transaction gain (loss)	196	130	122	71
Total non-operating income (loss)	245	131	206	130
Income (loss) before income taxes	409	(596)	539	(1,958)
Income tax (expense) benefit	(109)	(61)	(144)	(519)
Net income (loss)	$ 300	$ (657)	$ 395	$ (2,477)
Basic earnings (loss) per share	$ 0.03	$ (0.08)	$ 0.04	$ (0.29)
Diluted earnings (loss) per share	$ 0.03	$ (0.08)	$ 0.04	$ (0.29)
Weighted-average basic shares	8,904	8,709	8,861	8,665
Weighted-average diluted shares	9,075	8,709	9,052	8,665