2. Summary of Significant Accounting Policies (Details - Revenue) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Revenues	$ 95,868	$ 59,702	$ 53,603
Manufacturing Revenue [Member]
Revenues	83,678	52,046	43,432
Process Development Revenue [Member]
Revenues	$ 12,190	$ 7,656	$ 10,171