Note 2 - Significant Accounting Policies - Schedule of Earnings Per Share (Details) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net income applicable to common shareholders	$ 3,416,651	$ 3,530,951
Weighted average shares, basic (in shares)	19,087,000	19,502,000
Warrants to purchase Common Stock (in shares)	293,000	252,000
Weighted average shares, diluted (in shares)	19,380,000	19,754,000
Basic (in dollars per share)	$ 0.18	$ 0.18
Diluted (in dollars per share)	$ 0.18	$ 0.18