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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Revenues $ 19,913 $ 17,830 $ 59,847 $ 52,770
Cost of revenues 7,704 6,778 23,430 20,890
Gross profit 12,209 11,052 36,417 31,880
Operating expenses        
Selling 1,517 1,772 5,604 5,177
General and administrative 5,885 4,740 17,404 12,581
Research and development 975 832 2,929 2,459
Total operating expenses 8,377 7,344 25,937 20,217
Operating income 3,832 3,708 10,480 11,663
Other (expense) income, net (381) 5 (710) (314)
Earnings before income taxes 3,451 3,713 9,770 11,349
Income taxes 1,090 1,310 3,351 4,005
Net income $ 2,361 $ 2,403 $ 6,419 $ 7,344
Net income per share:        
Basic (in dollars per share) $ 0.65 $ 0.68 $ 1.79 $ 2.09
Diluted (in dollars per share) $ 0.63 $ 0.66 $ 1.72 $ 2.01
Weighted average common shares outstanding:        
Basic (in shares) 3,614 3,532 3,596 3,513
Diluted (in shares) 3,755 3,654 3,729 3,649