Note 8 - Equity Transactions and Stock-based Compensation - Summary of the Company's Stock Option Activity, and Related Information (Details)	9 Months Ended
	Mar. 31, 2024 $ / shares shares
Balance (in shares) | shares	43,760,284
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 0.35
Granted (in shares) | shares	782,500
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 0.27
Exercised (in shares) | shares	(150,000)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 0.09
Terminated (in shares) | shares	(9,167)
Terminated, weighted average exercise price (in dollars per share) | $ / shares	$ 0.58
Expired (in shares) | shares	(241,434)
Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 0.44
Balance (in shares) | shares	4,758,183
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 0.41
Exercisable (in shares) | shares	3,754,317
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 0.34