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Note 5 - Stockholders' Equity (Details Textual) - $ / shares |  | 3 Months Ended |
--- | --- | --- | ---
Dec. 21, 2021 | Mar. 31, 2022 | Jun. 30, 2021
Common Stock [Member] |  |  |
Equity Securities, Notice of Deficiency, Failure to Maintain Minimum Bid Price, Amount (in dollars per share) | $ 1.00 |  |
Equity Securities, Minimum Closing Bid Price (in dollars per share) | $ 1.00 |  |
Equity Securities, Threshold Consecutive Trading Days (Day) | 10 days |  |
Series D Preferred Stock [Member] |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  | 280,898 | 280,898
Preferred Stock, Conversion Basis |  | one |
Preferred Stock, Voting Rights |  | 0 |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  | 280,898 | 280,898

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