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.