Consolidated Balance Sheets (Parentheticals) - $ / shares	Jun. 30, 2022	Jun. 30, 2021
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	2,500,000	2,500,000
Preferred stock, shares issued (in shares)	280,898	280,898
Preferred stock, shares outstanding (in shares)	280,898	280,898
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	250,000,000	50,000,000
Common stock, shares issued (in shares)	50,567,864	49,450,558
Common stock, shares outstanding (in shares)	50,567,864	49,450,558