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, 2025 $ / shares shares
Balance (in shares) | shares	4,749,183
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 0.34
Granted (in shares) | shares	690,000
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 0.28
Exercised (in shares) | shares	(201,110)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 0.09
Terminated (in shares) | shares	(11,834)
Terminated, weighted average exercise price (in dollars per share) | $ / shares	$ 0.33
Expired (in shares) | shares	(149,333)
Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 0.26
Balance (in shares) | shares	5,076,906
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 0.41
Exercisable (in shares) | shares	4,023,073
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 0.36