Summary of Significant Accounting Policies (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Product Information [Line Items]
Revenues	$ 38,018	$ 31,508	$ 109,467	$ 88,371
Manufacturing Revenue [Member]
Product Information [Line Items]
Revenues	32,182	26,170	91,277	73,858
Process Development Revenue [Member]
Product Information [Line Items]
Revenues	$ 5,836	$ 5,338	$ 18,190	$ 14,513