6. Equity Compensation Plans (Details - Share based compensation) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Share based compensation	$ 3,854	$ 2,499	$ 1,595
Cost of revenues [Member]
Share based compensation	1,404	922	474
Selling, general and administrative
Share based compensation	$ 2,450	$ 1,577	$ 1,121