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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Condensed Statements of Income        
Revenues $ 12,676 $ 11,706 $ 23,894 $ 22,266
Cost of revenues 5,076 4,458 9,497 8,562
Gross profit 7,600 7,248 14,397 13,704
Operating expenses        
Selling 1,419 1,072 2,502 2,074
General and administrative 3,136 2,169 5,222 4,023
Research and development 530 519 1,115 899
Total operating expenses 5,085 3,760 8,839 6,996
Operating income 2,515 3,488 5,558 6,708
Other Income (expense), net 423 (36) 395 (70)
Earnings before income taxes 2,938 3,452 5,953 6,638
Income taxes 1,006 1,204 2,161 2,290
Net income $ 1,932 $ 2,248 $ 3,792 $ 4,348
Net income per share:        
Basic (in dollars per share) $ 0.57 $ 0.67 $ 1.11 $ 1.30
Diluted (in dollars per share) $ 0.54 $ 0.64 $ 1.06 $ 1.23
Weighted average common shares outstanding:        
Basic (in shares) 3,412 3,349 3,403 3,343
Diluted (in shares) 3,592 3,538 3,568 3,531