Note 12 - Equity Transactions and Stock-based Compensation - Summary of the Company's Stock Option Activity, and Related Information (Details) - $ / shares	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Balance (in shares)	4,376,284	4,443,933
Balance, weighted average exercise price (in dollars per share)	$ 0.35	$ 0.36
Granted (in shares)	782,500	527,000
Granted, weighted average exercise price (in dollars per share)	$ 0.27	$ 0.42
Exercised (in shares)	(150,000)	0
Exercised, weighted average exercise price (in dollars per share)	$ 0.09	$ 0
Terminated (in shares)	(18,000)	0
Terminated, weighted average exercise price (in dollars per share)	$ 0.53	$ 0
Expired (in shares)	(241,601)	(594,649)
Expired, weighted average exercise price (in dollars per share)	$ 0.44	$ 0.46
Balance (in shares)	4,749,183	4,376,284
Balance, weighted average exercise price (in dollars per share)	$ 0.34	$ 0.35
Exercisable (in shares)	3,804,150	3,626,551
Exercisable, weighted average exercise price (in dollars per share)	$ 0.34	$ 0.3