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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