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Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues	$ 22,954	$ 24,409	$ 45,627	$ 45,523
Cost of revenues	9,721	10,685	19,723	19,785
Gross profit	13,233	13,724	25,904	25,738
Operating expenses
Selling	2,288	2,694	4,967	5,118
General and administrative	6,412	5,973	13,269	11,953
Research and development	885	1,045	2,038	2,080
Total operating expenses	9,585	9,712	20,274	19,151
Operating income	3,648	4,012	5,630	6,587
Other expense, net	542	800	1,221	1,206
Earnings before income taxes	3,106	3,212	4,409	5,381
Income taxes	753	854	539	1,093
Net income	$ 2,353	$ 2,358	$ 3,870	$ 4,288
Net income per share:
Basic (in dollars per share)	$ 0.63	$ 0.64	$ 1.03	$ 1.17
Diluted (in dollars per share)	$ 0.60	$ 0.62	$ 0.98	$ 1.12
Weighted average common shares outstanding:
Basic (in shares)	3,764	3,669	3,754	3,657
Diluted (in shares)	3,935	3,831	3,934	3,816

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