Quarterly report pursuant to Section 13 or 15(d)

Note 8 - October 2019 Registered Direct Offering (Details Textual)

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Note 8 - October 2019 Registered Direct Offering (Details Textual) - USD ($)
9 Months Ended
Oct. 18, 2019
Jun. 30, 2022
Jun. 30, 2021
Series I Warrant [Member]      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 1    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.22    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   14,285,714  
October 2019 Placement Agent Warrants [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.21875    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 1,071,429    
Warrants and Rights Outstanding, Term (Year) 5 years    
Series I and Placement Warrants [Member]      
Class of Warrant or Right, Warrants Exercised (in shares)   0 0
Placement Fees [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   1,071,429  
October 2019 Registered Direct Offering [Member]      
Stock Issued During Period, Shares, New Issues (in shares) 14,285,714    
Shares Issued, Price Per Share (in dollars per share) $ 0.175    
Proceeds from Issuance or Sale of Equity, Total $ 2,500,000    
Payments of Stock Issuance Costs $ 333,000    
October 2019 Registered Direct Offering [Member] | Minimum [Member]      
Securities Purchase Agreement, Cash Placement Fee 6.00%    
October 2019 Registered Direct Offering [Member] | Maximum [Member]      
Securities Purchase Agreement, Cash Placement Fee 8.20%    
October 2019 Registered Direct Offering [Member] | Placement Fees [Member] | Wainwright [Member]      
Payments of Stock Issuance Costs $ 158,000