Note 5 - Stockholders' Deficit - Summary of Stock Purchase Warrants Outstanding (Details) - Stock Purchase Warrant [Member] - $ / shares	12 Months Ended
	Jun. 30, 2023		Jun. 30, 2022
Balance, number of warrant (in shares)	0	[1]	4,000,000
Balance, exercise price (in dollars per share)			$ 0.05
Expired, number of warrants (in shares)	(4,000,000)
Expired, exercise price (in dollars per share)	$ 0.05
Weighted Average [Member]
Balance, exercise price (in dollars per share)			$ 0.05
Expired, exercise price (in dollars per share)	$ 0.05

[1] On November 16, 2022, these warrants expired unexercised.