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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement        
Net revenues $ 13,263 $ 15,542 $ 26,208 $ 31,954
Cost of revenues 7,202 8,140 14,208 17,086
Gross profit 6,061 7,402 12,000 14,868
Operating expenses:        
Research and development 2,946 2,951 6,019 5,948
Selling, general and administrative 4,156 4,210 8,491 9,220
Total operating expenses 7,102 7,161 14,510 15,168
Income (loss) from operations (1,041) 241 (2,510) (300)
Interest income, net 78 95 174 199
Other income (expense), net 34 (10) 9 (3)
Income (loss) before income taxes (929) 326 (2,327) (104)
Provision (benefit) for income taxes 21 (60) 69 (49)
Net income (loss) $ (950) $ 386 $ (2,396) $ (55)
Net income (loss) per share:        
Basic $ (0.04) $ 0.01 $ (0.09)  
Diluted $ (0.04) $ 0.01 $ (0.09)  
Weighted average shares used in per share calculations:        
Basic 25,540 27,631 26,512 27,407
Diluted 25,540 28,975 26,512 27,407