Note 5 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Dec. 19, 2022	Dec. 31, 2022	Dec. 05, 2022	Nov. 09, 2022	Jun. 30, 2022	[1]
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001	$ 0.001		$ 0.001
Preferred Stock, Shares Issued (in shares)		280,898			280,898
Equity Securities, Minimum Closing Bid Price (in dollars per share)	$ 1.00
Equity Securities, Threshold Consecutive Trading Days (Day)	10 days
Share Repurchase Program Authorized November 2022 [Member]
Stock Repurchase Program, Authorized Amount				$ 1
Treasury Stock, Shares, Acquired (in shares)		0
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)		280,898

[1] The balance sheet at June 30, 2022, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by the United States generally accepted accounting principles for complete financial statements.