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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Condensed Consolidated Statements of Income        
Revenues $ 13,116 $ 11,361 $ 37,010 $ 33,627
Cost of revenues 5,410 4,414 14,907 12,976
Gross profit 7,706 6,947 22,103 20,651
Operating expenses        
Selling 1,595 1,223 4,097 3,297
General and administrative 2,781 2,759 8,003 6,782
Research and development 524 501 1,639 1,399
Total operating expenses 4,900 4,483 13,739 11,478
Operating income 2,806 2,464 8,364 9,173
Other (expense) income, net (79) (38) 316 (109)
Earnings before income taxes 2,727 2,426 8,680 9,064
Income taxes 981 883 3,142 3,173
Net income $ 1,746 $ 1,543 $ 5,538 $ 5,891
Net income per share:        
Basic (in dollars per share) $ 0.51 $ 0.46 $ 1.62 $ 1.76
Diluted (in dollars per share) $ 0.48 $ 0.44 $ 1.54 $ 1.67
Weighted average common shares outstanding:        
Basic (in shares) 3,434 3,360 3,414 3,349
Diluted (in shares) 3,637 3,542 3,591 3,527