5. Equity Compensation Plans (Details - Share based compensation) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Share based compensation	$ 595	$ 458	$ 1,849	$ 1,080
Cost of revenues [Member]
Share based compensation	248	147	679	317
Selling, general and administrative
Share based compensation	$ 347	$ 311	$ 1,170	$ 763