Note 8 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions	Nov. 22, 2022	Jun. 30, 2024 $ / shares shares	Jun. 30, 2023 $ / shares shares	Dec. 21, 2022 $ / shares shares	Nov. 09, 2022 USD ($)	Jun. 30, 2022 $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001	$ 0.001
Preferred Stock, Shares Issued (in shares) | shares		280,898	280,898
Stock Repurchase Program, Authorized Amount | $					$ 1
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001	$ 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		72.1	$ 72.1			$ 72.1
Rights Plan [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares				1
Preferred Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 58
Series D Preferred Stock [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001
Preferred Stock, Shares Issued (in shares) | shares		280,898
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	30