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CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts) (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Net sales $ 5,947 $ 3,808 $ 15,387 $ 15,700
Cost of goods sold 2,670 1,806 6,887 6,430
Gross margin 3,277 2,002 8,500 9,270
OPERATING EXPENSES:        
Research and development 1,567 1,507 4,763 4,868
Selling, general and administrative 1,810 1,535 5,324 5,338
Total operating expenses 3,377 3,042 10,087 10,206
Operating income (loss) (100) (1,040) (1,587) (936)
NON-OPERATING INCOME (LOSS):        
Interest income 4 25 13 47
Gain on sale of assets 0 0 0 60
Foreign currency transaction gain (loss) (271) 226 (302) 190
Total non-operating income (loss) (267) 251 (289) 297
Income (loss) before income taxes (367) (789) (1,876) (639)
Income tax (expense) benefit (340) (55) (442) (52)
Net income (loss) $ (707) $ (844) $ (2,318) $ (691)
Basic earnings (loss) per share $ (0.09) $ (0.10) $ (0.28) $ (0.08)
Diluted earnings (loss) per share $ (0.09) $ (0.10) $ (0.28) $ (0.08)
Weighted-average basic shares (in thousands) 8,394 8,217 8,305 8,259
Weighted-average diluted shares (in thousands) 8,394 8,217 8,305 8,259