6. Equity Compensation Plans (Details - Share based compensation) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Share based compensation	$ 999	$ 595	$ 2,754	$ 1,849
Cost of revenues [Member]
Share based compensation	386	248	1,035	679
Selling, general and administrative
Share based compensation	$ 613	$ 347	$ 1,719	$ 1,170