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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)        
Net sales $ 5,393 $ 5,423 $ 17,516 $ 16,584
Cost of goods sold 2,659 2,499 8,634 7,684
Gross margin 2,734 2,924 8,882 8,900
Operating expenses:        
Research and development 1,709 1,544 4,886 4,539
Selling, general and administrative 2,418 1,705 6,609 6,112
Total operating expenses 4,127 3,249 11,495 10,651
Operating income (loss) (1,393) (325) (2,613) (1,751)
Non-operating income (loss):        
Interest income 34 71 107 224
Foreign currency transaction gain (loss) (3) (53) 22 9
Total non-operating income (loss) 31 18 129 233
Income (loss) before income taxes (1,362) (307) (2,484) (1,518)
Income tax (expense) benefit 0 0 (2) (393)
Net income (loss) $ (1,362) $ (307) $ (2,486) $ (1,911)
Basic earnings (loss) per share $ (0.15) $ (0.03) $ (0.27) $ (0.21)
Diluted earnings (loss) per share $ (0.15) $ (0.03) $ (0.27) $ (0.21)
Weighted-average basic shares 9,389 9,235 9,308 9,121
Weighted-average diluted shares 9,389 9,235 9,308 9,121