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Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Revenues |  |  |
Product | $ 35,351 | $ 30,396 | $ 26,115
Other | 11,084 | 9,220 | 8,112
Total revenues | 46,435 | 39,616 | 34,227
Cost of revenues | 17,573 | 16,105 | 14,659
Gross profit | 28,862 | 23,511 | 19,568
Operating expenses |  |  |
Selling | 4,630 | 3,909 | 3,687
General and administrative | 9,117 | 5,416 | 4,576
Research and development | 2,011 | 1,359 | 1,441
Impairment of intangible asset |  | 350 |
Total operating expenses | 15,758 | 11,034 | 9,704
Operating income | 13,104 | 12,477 | 9,864
Other expense, net | (126) | (146) | (113)
Earnings before income taxes | 12,978 | 12,331 | 9,751
Income taxes | 4,528 | 4,412 | 3,568
Net income | $ 8,450 | $ 7,919 | $ 6,183
Net income per share: |  |  |
Basic (in dollars per share) | $ 2.52 | $ 2.41 | $ 1.91
Diluted (in dollars per share) | $ 2.35 | $ 2.29 | $ 1.86
Weighted average common shares outstanding: |  |  |
Basic (in shares) | 3,357 | 3,285 | 3,231
Diluted (in shares) | 3,593 | 3,462 | 3,330

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