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STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenues $ 39,616 $ 34,227
Cost of revenues 16,105 14,659
Gross profit 23,511 19,568
Operating expenses    
Selling 3,909 3,687
General and administrative 5,416 4,576
Research and development 1,359 1,441
Impairment of intangible asset 350  
Total operating expenses 11,034 9,704
Operating income 12,477 9,864
Other expense (146) (113)
Earnings before income taxes 12,331 9,751
Income taxes 4,412 3,568
Net income $ 7,919 $ 6,183
Net income per share:    
Basic (in dollars per share) $ 2.41 $ 1.91
Diluted (in dollars per share) $ 2.29 $ 1.86
Average common shares outstanding:    
Basic (in shares) 3,285 3,231
Diluted (in shares) 3,462 3,330