Note 2 - Convertible Notes Payable - Schedule of Detachable Warrants (Details) - USD ($)		3 Months Ended	12 Months Ended
		Jun. 30, 2024	Mar. 31, 2024
Balance, outstanding (in shares)		500,000
Outstanding, weighted average exercise price (in dollars per share)		$ 1
Outstanding, remaining term (Year)		4 years 2 months 23 days	4 years 5 months 23 days
Outstanding, intrinsic value	[1]	$ 0	$ 1,010,000
Granted, outstanding (in shares)		0
Granted, weighted average exercise price (in dollars per share)		$ 0
Exercised, outstanding (in shares)		0
Exercised, weighted average exercise price (in dollars per share)		$ 0
Forfeited/Cancelled, outstanding (in shares)		0
Forfeited/Cancelled, weighted average exercise price (in dollars per share)		$ 0
Expired, outstanding (in shares)		0
Expired, weighted average exercise price (in dollars per share)		$ 0
Balance, outstanding (in shares)		500,000	500,000
Outstanding, weighted average exercise price (in dollars per share)		$ 1	$ 1
Exercisable (in shares)		500,000
Exercisable, weighted average exercise price (in dollars per share)		$ 1
Exercisable, remaining term (Year)		4 years 2 months 23 days
Exercisable, intrinsic value	[1]	$ 0

[1] Aggregate Intrinsic Value = Excess of market value over the exercise price of all in-the-money warrants. No outstanding and exercisable warrants issued in connection with the Company's Notes were in-the-money as of June 30, 2024.