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Condensed Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Revenues $ 10,559 $ 9,297
Cost of revenues 4,104 3,909
Gross profit 6,455 5,388
Operating expenses    
Selling 1,002 939
General and administrative 1,854 1,348
Research and development 380 408
Total operating expenses 3,236 2,695
Operating income 3,219 2,693
Other expense 34 50
Earnings before income taxes 3,185 2,643
Income taxes 1,086 964
Net income $ 2,099 $ 1,679
Net income per share:    
Basic (in dollars per share) $ 0.63 $ 0.51
Diluted (in dollars per share) $ 0.59 $ 0.49
Average common shares outstanding:    
Basic (in shares) 3,337 3,274
Diluted (in shares) 3,541 3,414