Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 37,175	$ 35,820	$ 108,534	$ 104,117
Cost of revenue	19,323	18,293	55,130	53,340
Gross profit	17,852	17,527	53,404	50,777
Operating expenses
Research and development expenses	4,712	4,850	14,639	14,381
Selling, general and administrative expenses	10,027	10,303	31,729	29,484
Total operating expenses	14,739	15,153	46,368	43,865
Income from operations	3,113	2,374	7,036	6,912
Interest income	141	7	491	32
Interest expense	(79)	(114)	(269)	(342)
Other income (expenses), net	138	(57)	578	553
Gain on reversal of accrued contingent liability	1,359		1,359	835
Income before provision for income taxes	4,672	2,210	9,195	7,990
Provision for income taxes	797	483	3,130	2,543
Net Income	$ 3,875	$ 1,727	$ 6,065	$ 5,447
Earnings per share:
Basic	$ 0.09	$ 0.05	$ 0.14	$ 0.15
Diluted	$ 0.09	$ 0.04	$ 0.14	$ 0.14
Weighted average number of common shares outstanding
Basic	43,102,144	36,664,718	42,992,839	36,633,300
Diluted	45,294,983	38,725,682	45,167,708	38,814,422