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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Revenues [1] $ 34,920 $ 29,941
Cost of revenues 12,709 9,601
Gross profit 22,211 20,340
Operating expenses:    
Selling 4,858 4,075
General and administrative 11,419 10,099
Research and development 2,811 2,596
Total operating expenses 19,088 16,770
Operating income 3,123 3,570
Nonoperating expenses    
Interest expense and amortization of debt discount 874 1,919
Other expense, net 831 897
Total nonoperating expense 1,705 2,816
Earnings before income taxes 1,418 754
Income tax (benefit) (577) (463)
Net income $ 1,995 $ 1,217
Earnings per share:    
Basic (in dollars per share) $ 0.39 $ 0.27
Diluted (in dollars per share) $ 0.38 $ 0.26
Weighted-average common shares outstanding:    
Basic (in shares) 5,152 4,528
Diluted (in shares) 5,301 4,669
Product [Member]    
Revenues $ 34,920 $ 29,941
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.