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Condensed Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenues $ 11,706 $ 9,701 $ 22,266 $ 18,998
Cost of revenues 4,458 3,927 8,562 7,836
Gross profit 7,248 5,774 13,704 11,162
Operating expenses        
Selling 1,072 1,038 2,074 1,977
General and administrative 2,169 1,144 4,023 2,492
Research and development 519 306 899 714
Total operating expenses 3,760 2,488 6,996 5,183
Operating income 3,488 3,286 6,708 5,979
Other expense 36 50 70 99
Earnings before income taxes 3,452 3,236 6,638 5,880
Income taxes 1,204 1,183 2,290 2,147
Net income $ 2,248 $ 2,053 $ 4,348 $ 3,733
Net income per share:        
Basic (in dollars per share) $ 0.67 $ 0.63 $ 1.30 $ 1.14
Diluted (in dollars per share) $ 0.64 $ 0.59 $ 1.23 $ 1.09
Weighted average common shares outstanding:        
Basic (in shares) 3,349 3,282 3,343 3,278
Diluted (in shares) 3,538 3,453 3,531 3,433