Note 2 - Significant Accounting Policies - Schedule of Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Net income applicable to common shareholders	$ 1,304,538	$ 1,118,733	$ 2,536,475	$ 2,257,234
Weighted average shares, basic (in shares)	18,162,000	18,402,000	18,193,000	18,419,000
Warrants to purchase Common Stock (in shares)	643,000	228,000	629,000	259,000
Weighted average shares, diluted (in shares)	18,805,000	18,630,000	18,822,000	18,678,000
Basic (in dollars per share)	$ 0.07	$ 0.06	$ 0.14	$ 0.12
Diluted (in dollars per share)	$ 0.07	$ 0.06	$ 0.14	$ 0.12