Quarterly report pursuant to Section 13 or 15(d)

Note 9 - October 2019 Registered Direct Offering (Details Textual)

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Note 9 - October 2019 Registered Direct Offering (Details Textual)
 3 Months Ended 6 Months Ended 9 Months Ended
Oct. 16, 2019
USD ($)
$ / shares
shares
Jun. 30, 2023
shares
Jun. 30, 2023
shares
Jun. 30, 2023
shares
Stock Issued During Period, Shares, New Issues     215,625  
Warrants and Rights Outstanding, Term   5 years 5 years 5 years
Series I Warrant [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 44.00      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   71,429 71,429 71,429
Proceeds from Subscribed, Unissued Common Stock and Warrants | $ $ 2,500,000      
Payments of Stock Issuance Costs | $ $ 158,000      
Series I Warrant [Member] | Minimum [Member]        
Percentage of Fee on Gross Proceeds of Warrants 0.060      
Series I Warrant [Member] | Maximum [Member]        
Percentage of Fee on Gross Proceeds of Warrants 0.082      
October 2019 Placement Agent Warrants [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 43.75      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 5,358      
Series I and Placement Agent Warrants [Member]        
Class of Warrant or Right, Exercised   0   0
Placement Agent Warrants [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   5,358 5,358 5,358
Registered Direct Offering 2019 [Member]        
Number Of Accredited Investors 7      
Stock Issued During Period, Shares, New Issues 71,429      
Shares Issued, Price Per Share | $ / shares $ 35.00      
Proceeds from Subscribed, Unissued Common Stock and Warrants | $ $ 2,500,000      
Payments of Financing Costs | $ 333,000      
Payments of Stock Issuance Costs | $ $ 158,000