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Condensed Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Condensed Statements of Income        
Revenues $ 11,361 $ 9,650 $ 33,627 $ 28,648
Cost of revenues 4,414 3,765 12,976 11,601
Gross profit 6,947 5,885 20,651 17,047
Operating expenses        
Selling 1,223 949 3,297 2,926
General and administrative 2,759 1,432 6,782 3,924
Research and development 501 342 1,399 1,056
Total operating expenses 4,483 2,723 11,478 7,906
Operating income 2,464 3,162 9,173 9,141
Other expense, net 38 31 109 130
Earnings before income taxes 2,426 3,131 9,064 9,011
Income taxes 883 1,144 3,173 3,291
Net income $ 1,543 $ 1,987 $ 5,891 $ 5,720
Net income per share:        
Basic (in dollars per share) $ 0.46 $ 0.60 $ 1.76 $ 1.74
Diluted (in dollars per share) $ 0.44 $ 0.57 $ 1.67 $ 1.66
Weighted average common shares outstanding:        
Basic (in shares) 3,360 3,286 3,349 3,280
Diluted (in shares) 3,542 3,498 3,527 3,454