CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 24,217	$ 25,835
Cost of goods sold	11,007	11,115
Gross margin	13,210	14,720
Operating expenses:
Research and development	6,083	6,635
Selling, general and administrative	7,876	8,358
Total operating expenses	13,959	14,993
Operating income (loss)	(749)	(273)
Non-operating income (loss):
Interest income	34	11
Gain on sale of assets	57	21
Foreign currency transaction gain (loss)	221	(202)
Total non-operating income (loss)	312	(170)
Income (loss) before income taxes	(437)	(443)
Income tax (expense) benefit	(683)	(112)
Net income (loss)	$ (1,120)	$ (555)
Basic earnings (loss) per share	$ (0.13)	$ (0.06)
Diluted earnings (loss) per share	$ (0.13)	$ (0.06)
Weighted-average basic shares	8,741	8,545
Weighted-average diluted shares	8,741	8,545