Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2022	Jun. 30, 2021
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001	[1]
Preferred stock, authorized (in shares)	50,000,000	50,000,000	[1]
Preferred stock, issued (in shares)	49,360	49,360	[1]
Preferred stock, outstanding (in shares)	49,360	49,360	[1]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	900,000,000	900,000,000
Common stock, shares issued (in shares)	39,383,459	37,485,959
Common stock, shares outstanding (in shares)	39,383,459	37,485,959

[1] Derived from audited financial statements