CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)
Net sales	$ 5,062	$ 7,398	$ 11,161	$ 14,629
Cost of goods sold	2,305	3,025	5,184	5,954
Gross margin	2,757	4,373	5,977	8,675
Operating expenses:
Research and development	1,413	1,720	2,995	3,345
Selling, general and administrative	1,910	2,489	4,408	4,997
Total operating expenses	3,323	4,209	7,403	8,342
Operating income (loss)	(566)	164	(1,426)	333
Non-operating income (loss):
Interest income	73	49	153	84
Foreign currency transaction gain (loss)	49	196	62	122
Total non-operating income (loss)	122	245	215	206
Income (loss) before income taxes	(444)	409	(1,211)	539
Income tax (expense) benefit	(353)	(109)	(393)	(144)
Net income (loss)	$ (797)	$ 300	$ (1,604)	$ 395
Basic earnings (loss) per share	$ (0.09)	$ 0.03	$ (0.18)	$ 0.04
Diluted earnings (loss) per share	$ (0.09)	$ 0.03	$ (0.18)	$ 0.04
Weighted-average basic shares	9,104	8,904	9,063	8,861
Weighted-average diluted shares	9,104	9,075	9,063	9,052