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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues [1] $ 25,536 $ 24,865 $ 51,824 $ 50,007
Cost of revenues 10,060 10,288 20,209 20,339
Gross profit 15,476 14,577 31,615 29,668
Operating expenses:        
Selling 2,274 1,804 4,482 3,694
General and administrative 7,703 7,493 15,223 15,093
Research and development 915 842 1,934 1,679
Legal settlement 3,300 3,300
Total operating expenses 10,892 13,439 21,639 23,766
Operating income 4,584 1,138 9,976 5,902
Other expense (income), net 920 (168) 952 196
Earnings before income taxes 3,664 1,306 9,024 5,706
Income tax expense 602 312 1,365 482
Net income $ 3,062 $ 994 $ 7,659 $ 5,224
Earnings per share:        
Basic (in dollars per share) $ 0.74 $ 0.26 $ 1.90 $ 1.36
Diluted (in dollars per share) $ 0.71 $ 0.25 $ 1.82 $ 1.30
Weighted-average common shares outstanding:        
Basic (in shares) 4,155 3,850 4,029 3,833
Diluted (in shares) 4,321 4,046 4,205 4,029
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.