Note 12 - Stockholders' Equity (Details Textual) - shares	Jan. 15, 2021	Feb. 07, 2019	Sep. 30, 2021	Jun. 30, 2021	[1]	Jun. 30, 2020
Preferred Stock, Shares Outstanding, Ending Balance (in shares)			49,360	49,360
Series B Convertible Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)			20
Conversion of Stock, Shares Converted (in shares)	3,672	383,919
Conversion of Stock, Shares Issued (in shares)	73,440	7,678,380
Preferred Stock, Shares Outstanding, Ending Balance (in shares)			49,360			53,032

[1] Derived from audited financial statements