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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