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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues $ 35,840 $ 31,860 $ 70,760 $ 61,801
Cost of revenues 12,700 10,575 25,409 20,176
Gross profit 23,140 21,285 45,351 41,625
Operating expenses:        
Selling 4,643 3,786 9,501 7,861
General and administrative 11,683 10,615 23,102 20,714
Research and development 2,613 2,414 5,424 5,010
Total operating expenses 18,939 16,815 38,027 33,585
Operating income 4,201 4,470 7,324 8,040
Nonoperating expenses:        
Interest expense and amortization of debt discount 815 1,934 1,629 3,853
Other (income) expense, net (1,157) 152 (266) 1,049
Total nonoperating (income) expense (342) 2,086 1,363 4,902
Earnings before income taxes 4,543 2,384 5,961 3,138
Income tax provision (benefit) 823 (295) 246 (758)
Net income $ 3,720 $ 2,679 $ 5,715 $ 3,896
Earnings per share:        
Basic (in dollars per share) $ 0.71 $ 0.52 $ 1.10 $ 0.81
Diluted (in dollars per share) $ 0.70 $ 0.51 $ 1.07 $ 0.79
Weighted-average common shares outstanding:        
Basic (in shares) 5,211 5,110 5,182 4,821
Diluted (in shares) 5,344 5,241 5,324 4,958
Product [Member]        
Revenues $ 35,840 $ 31,860 $ 70,760 $ 61,801