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Note 2 - Significant Accounting Policies - Schedule of Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Net income applicable to common shareholders	$ 1,416,082	$ 1,516,409	$ 3,952,557	$ 3,773,643
Weighted average shares, basic (in shares)	18,194,000	18,394,000	18,194,000	18,408,000
Warrants to purchase Common Stock (in shares)	760,000	357,000	680,000	294,000
Weighted average shares, diluted (in shares)	18,954,000	18,751,000	18,874,000	18,702,000
Basic (in dollars per share)	$ 0.08	$ 0.08	$ 0.22	$ 0.2
Diluted (in dollars per share)	$ 0.08	$ 0.08	$ 0.21	$ 0.2

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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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