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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares | Mar. 31, 2023 | Jun. 30, 2022
--- | --- | ---
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 | [1]
Preferred stock, shares authorized (in shares) | 2,500,000 | 2,500,000 | [1]
Preferred stock, shares issued (in shares) | 280,898 | 280,898 | [1]
Preferred stock, shares outstanding (in shares) | 280,898 | 280,898 | [1]
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
Common stock, shares authorized (in shares) | 250,000,000 | 250,000,000 |
Common stock, shares issued (in shares) | 1,692,600 | 1,685,595 |
Common stock, shares outstanding (in shares) | 1,686,723 | 1,685,595 |
Treasury stock, shares (in shares) | 5,821 | 0 |
[1] | The balance sheet at June 30, 2022, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by the United States generally accepted accounting principles for complete financial statements.

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