Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Revenues      
Product $ 71,055 $ 66,274 $ 58,910
Service 22,610 18,385 12,420
Total revenues 93,665 84,659 71,330
Cost of revenues      
Cost of products 26,548 26,957 23,128
Cost of services 13,878 6,289 4,810
Total cost of revenues 40,426 33,246 27,938
Gross profit 53,239 51,413 43,392
Operating expenses      
Selling 9,955 7,500 7,176
General and administrative 22,814 23,618 17,058
Research and development 4,157 3,972 3,294
Total operating expenses 36,926 35,090 27,528
Operating income 16,313 16,323 15,864
Other expense, net 2,017 768 517
Earnings before income taxes 14,296 15,555 15,347
Income taxes 3,113 4,386 5,764
Net income $ 11,183 $ 11,169 $ 9,583
Net income per share:      
Basic (in dollars per share) $ 3.04 $ 3.10 $ 2.72
Diluted (in dollars per share) $ 2.91 $ 2.97 $ 2.63
Weighted average common shares outstanding:      
Basic (in shares) 3,679 3,605 3,521
Diluted (in shares) 3,844 3,757 3,650