Summary of Significant Accounting Policies (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Product Information [Line Items]
Revenues	$ 25,395	$ 34,757	$ 63,121	$ 71,449
Manufacturing Revenue [Member]
Product Information [Line Items]
Revenues	20,128	27,614	53,548	59,095
Process Development Revenue [Member]
Product Information [Line Items]
Revenues	$ 5,267	$ 7,143	$ 9,573	$ 12,354