Debt (Details - Interest expense) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Short-Term Debt [Line Items]
Amortization of issuance costs	$ 339	$ 260
Total interest expense associated with Convertible Notes	775	518
Convertible Notes [Member]
Short-Term Debt [Line Items]
Contractual interest expense	408	224
Amortization of issuance costs	265	260
Total interest expense associated with Convertible Notes	$ 673	$ 484