Note 12 - Stock Options and Incentive Plans - Restricted Stock Options Activity (Details) - $ / shares	6 Months Ended	12 Months Ended	49 Months Ended
	Oct. 31, 2024	Apr. 30, 2024	Apr. 30, 2023
Outstanding, shares (in shares)			8,200,000
Outstanding, weighted average fair value (in dollars per share)			$ 0.43
Forfeited, shares (in shares)	0	(1,525,000)	(975,000)
Forfeited, weighted average fair value (in dollars per share)	$ 0.4	$ 0.4	$ 0.4
Forfeited, shares (in shares)	0	(1,525,000)	(975,000)
Outstanding, shares (in shares)	5,700,000
Outstanding, weighted average fair value (in dollars per share)	$ 0.45
Vested shares (in shares)	2,350,000
Vested shares, weighted average fair value (in dollars per share)	$ 0.56
Non-vested shares (in shares)	3,350,000
Non-vested shares, weighted average fair value (in dollars per share)	$ 0.41