Note 2 - Significant Accounting Policies - Schedule of Earnings Per Share (Details) - USD ($)	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net income applicable to common shareholders	$ 5,003,845	$ 3,416,651
Weighted average shares, basic (in shares)	18,406,000	19,087,000
Warrants to purchase Common Stock (in shares)	360,000	293,000
Weighted average shares, diluted (in shares)	18,766,000	19,380,000
Basic (in dollars per share)	$ 0.27	$ 0.18
Diluted (in dollars per share)	$ 0.27	$ 0.18