CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)
Net sales	$ 6,099	$ 7,231
Cost of goods sold	2,879	2,929
Gross margin	3,220	4,302
Operating expenses:
Research and development	1,582	1,625
Selling, general and administrative	2,498	2,508
Total operating expenses	4,080	4,133
Operating income (loss)	(860)	169
Non-operating income (loss):
Interest income	80	35
Foreign currency transaction gain (loss)	14	(74)
Total non-operating income (loss)	94	(39)
Income (loss) before income taxes	(766)	130
Income tax (expense) benefit	(41)	(35)
Net income (loss)	$ (807)	$ 95
Basic earnings (loss) per share	$ (0.09)	$ 0.01
Diluted earnings (loss) per share	$ (0.09)	$ 0.01
Weighted-average basic shares	9,023	8,818
Weighted-average diluted shares	9,023	9,029