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Note 2 - Significant Accounting Policies - Schedule of Earnings Per Share (Details) - USD ($)	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Net income applicable to common shareholders	$ 1,231,937	$ 1,138,501
Weighted average shares, basic (in shares)	18,225,000	18,465,000
Warrants to purchase Common Stock (in shares)	614,000	288,000
Weighted average shares, diluted (in shares)	18,839,000	18,753,000
Basic (in dollars per share)	$ 0.07	$ 0.06
Diluted (in dollars per share)	$ 0.07	$ 0.06

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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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