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Condensed Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Sales $ 13,010 $ 13,142 $ 35,672 $ 42,713
Cost of goods sold 6,981 7,067 18,924 23,167
Gross profit 6,029 6,075 16,748 19,546
Operating expenses:        
Research and development 2,231 2,403 6,873 6,944
Sales and marketing 1,559 1,461 4,477 5,964
General and administrative 2,439 2,416 7,506 6,168
Total operating expenses 6,229 6,280 18,856 19,076
Income (loss) from operations (200) (205) (2,108) 470
Other expense (income):        
Interest income, net (23) (183) (194) (558)
Other expense     11  
Total other income (23) (183) (183) (558)
Income (loss) before income taxes (177) (22) (1,925) 1,028
Provision for income taxes 84 113 274 165
Net income (loss) $ (261) $ (135) $ (2,199) $ 863
Net income (loss) per share:        
Basic $ (0.03) $ (0.01) $ (0.23) $ 0.09
Diluted $ (0.03) $ (0.01) $ (0.23) $ 0.09
Weighted average shares used in calculating income (loss) per share:        
Basic 9,710 9,711 9,694 9,678
Diluted 9,710 9,711 9,694 10,083