CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 7,231	$ 4,965
Cost of goods sold	2,929	2,662
Gross margin	4,302	2,303
Operating expenses:
Research and development	1,625	1,616
Selling, general and administrative	2,508	2,048
Total operating expenses	4,133	3,664
Operating income (loss)	169	(1,361)
Non-operating income (loss):
Interest income	35	1
Gain on sale of assets	0	58
Foreign currency transaction gain (loss)	(74)	(60)
Total non-operating income (loss)	(39)	(1)
Income (loss) before income taxes	130	(1,362)
Income tax (expense) benefit	(35)	(458)
Net income (loss)	$ 95	$ (1,820)
Basic earnings (loss) per share	$ 0.01	$ (0.21)
Diluted earnings (loss) per share	$ 0.01	$ (0.21)
Weighted-average basic shares	8,818	8,622
Weighted-average diluted shares	9,029	8,622