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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Revenues [1] $ 26,288 $ 25,142
Cost of revenues 10,149 10,051
Gross profit 16,139 15,091
Operating expenses:    
Selling 2,208 1,890
General and administrative 7,520 7,600
Research and development 1,019 837
Total operating expenses 10,747 10,327
Operating income 5,392 4,764
Other expense, net 32 364
Earnings before income taxes 5,360 4,400
Income tax expense 763 170
Net income $ 4,597 $ 4,230
Earnings per share:    
Basic (in dollars per share) $ 1.18 $ 1.11
Diluted (in dollars per share) $ 1.13 $ 1.06
Weighted-average common shares outstanding:    
Weighted average outstanding shares of common stock (in shares) 3,901 3,816
Diluted (in shares) 4,086 4,006
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.