Leases (Details - Supplemental cash flow information) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 1,119	$ 963
Operating cash flows from finance lease	27	22
Financing cash flows from finance lease	130	83
Non-cash transaction:
Unpaid finance lease obligation	$ 0	$ 41