Summary of Significant Accounting Policies (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Product Information [Line Items]
Revenues	$ 33,815	$ 38,018	$ 96,936	$ 109,467
Manufacturing Revenues [Member]
Product Information [Line Items]
Revenues	29,093	32,182	82,641	91,277
Process Development Revenues [Member]
Product Information [Line Items]
Revenues	$ 4,722	$ 5,836	$ 14,295	$ 18,190