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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Revenues      
Revenue $ 96,179 $ 93,665 $ 84,659
Cost of revenues      
Cost of revenue 41,560 40,426 33,246
Gross profit 54,619 53,239 51,413
Operating expenses      
Selling 8,823 9,955 7,500
General and administrative 26,255 22,814 23,618
Research and development 3,539 4,157 3,972
Impairment loss on goodwill 13,819
Total operating expenses 52,436 36,926 35,090
Operating income 2,183 16,313 16,323
Other expense, net 1,882 2,017 768
Earnings before income taxes 301 14,296 15,555
Income taxes 3,263 3,113 4,386
Net (loss) income $ (2,962) $ 11,183 $ 11,169
Net (loss) income per share:      
Basic (in dollars per share) $ (0.79) $ 3.04 $ 3.10
Diluted (in dollars per share) $ (0.79) $ 2.91 $ 2.97
Weighted average common shares outstanding:      
Basic (in shares) 3,770 3,679 3,605
Diluted (in shares) 3,770 3,844 3,757
Product [Member]      
Revenues      
Revenue $ 72,172 $ 71,055 $ 66,274
Cost of revenues      
Cost of revenue 28,608 26,548 26,957
Service [Member]      
Revenues      
Revenue 24,007 22,610 18,385
Cost of revenues      
Cost of revenue $ 12,952 $ 13,878 $ 6,289