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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Revenues      
Product $ 66,085 $ 58,910 $ 44,539
Service 18,574 12,420 8,185
Total revenues 84,659 71,330 52,724
Cost of revenues      
Cost of products 26,957 23,128 16,062
Cost of services 6,289 4,810 4,974
Total cost of revenues 33,246 27,938 21,036
Gross profit 51,413 43,392 31,688
Operating expenses      
Selling 7,500 7,176 6,119
General and administrative 23,618 17,058 11,464
Research and development 3,972 3,294 2,320
Total operating expenses 35,090 27,528 19,903
Operating income 16,323 15,864 11,785
Other (expense) income, net (768) (517) 1,318
15,555 15,347 13,103
Income taxes 4,386 5,764 4,103
Net income $ 11,169 $ 9,583 $ 9,000
Net income per share:      
Basic (in dollars per share) $ 3.10 $ 2.72 $ 2.61
Diluted (in dollars per share) $ 2.97 $ 2.63 $ 2.49
Weighted average common shares outstanding:      
Basic (in shares) 3,605 3,521 3,445
Diluted (in shares) 3,757 3,650 3,611