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Note 2 - Significant Accounting Policies - Schedule of Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Net income applicable to common shareholders	$ 1,118,733	$ 725,457	$ 2,257,234	$ 1,525,663
Weighted average shares, basic (in shares)	18,402,000	19,357,000	18,419,000	19,370,000
Warrants to purchase common stock (in shares)	228,000	325,000	259,000	288,000
Weighted average shares, diluted (in shares)	18,630,000	19,682,000	18,678,000	19,658,000
Basic (in dollars per share)	$ 0.06	$ 0.04	$ 0.12	$ 0.08
Diluted (in dollars per share)	$ 0.06	$ 0.04	$ 0.12	$ 0.08

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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