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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Revenues      
Revenue [1] $ 103,135 $ 96,179 [2] $ 93,665 [2]
Cost of revenues      
Cost of revenue 42,219 41,560 40,426
Gross profit 60,916 54,619 53,239
Operating expenses      
Selling 8,260 8,823 9,955
General and administrative 31,295 26,255 22,814
Research and development 3,506 3,539 4,157
Impairment loss on goodwill and long-lived assets 4,774 13,819 [3] [3]
Legal settlement 3,300
Total operating expenses 51,135 52,436 36,926
Operating income 9,781 2,183 16,313
Other expense, net 1,158 1,882 2,017
Earnings before income taxes 8,623 301 14,296
Income tax expense 1,139 3,263 3,113
Net income (loss) $ 7,484 $ (2,962) [3] $ 11,183 [3]
Earnings (loss) per share:      
Basic (in dollars per share) $ 1.95 $ (0.79) $ 3.04
Diluted (in dollars per share) $ 1.86 $ (0.79) $ 2.91
Weighted-average common shares outstanding:      
Weighted average outstanding shares of common stock (in shares) 3,839 3,770 3,679
Diluted (in shares) 4,033 3,770 3,844
Product [Member]      
Revenues      
Revenue $ 81,798 $ 74,386 [2] $ 73,510 [2]
Cost of revenues      
Cost of revenue 30,250 29,877 26,548
Service [Member]      
Revenues      
Revenue 21,337 21,793 [2] 20,155 [2]
Cost of revenues      
Cost of revenue $ 11,969 $ 11,683 $ 13,878
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2] Product and service revenues for the years ended March 31, 2018 and March 31, 2017 were reclassified to align with the current year presentation See Note 2. "Revenue Recognition."
[3] Contingent consideration has been reclassified to align with current year presentation.