Note 6 - Stockholders' Equity (Details Textual) - $ / shares	3 Months Ended
	Dec. 31, 2024	Jun. 30, 2024	Dec. 21, 2022
Common Stock, Shares, Issued (in shares)	1,712,045	1,712,045
Common Stock, Shares, Outstanding (in shares)	1,701,729	1,701,729
Treasury Stock, Common, Shares (in shares)	10,316	10,316
Stock Issued During Period, Shares, New Issues (in shares)	0
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
Rights Plan [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in 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