CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)
Net sales	$ 5,948	$ 5,062	$ 12,124	$ 11,161
Cost of goods sold	2,988	2,305	5,976	5,184
Gross margin	2,960	2,757	6,148	5,977
Operating expenses:
Research and development	1,662	1,413	3,177	2,995
Selling, general and administrative	2,142	1,910	4,192	4,408
Total operating expenses	3,804	3,323	7,369	7,403
Operating income (loss)	(844)	(566)	(1,221)	(1,426)
Non-operating income (loss):
Interest income	35	73	73	153
Foreign currency transaction gain (loss)	47	49	26	62
Total non-operating income (loss)	82	122	99	215
Income (loss) before income taxes	(762)	(444)	(1,122)	(1,211)
Income tax (expense) benefit	20	(353)	(2)	(393)
Net income (loss)	$ (742)	$ (797)	$ (1,124)	$ (1,604)
Basic earnings (loss) per share	$ (0.08)	$ (0.09)	$ (0.12)	$ (0.18)
Diluted earnings (loss) per share	$ (0.08)	$ (0.09)	$ (0.12)	$ (0.18)
Weighted-average basic shares	9,296	9,104	9,267	9,063
Weighted-average diluted shares	9,296	9,104	9,267	9,063