Equity Compensation Plans (Details - ESPP Fair value assumptions) - Employee Stock Purchase Plan [Member]	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Risk-free interest rate	3.76%	0.15%	0.14%
Expected life (in years)	6 months	6 months	6 months
Expected volatility	68.60%	59.91%	75.50%
Expected dividend yield	0.00%	0.00%	0.00%