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
Feb. 17, 2021
shares
Oct. 18, 2019
shares
Oct. 16, 2019
USD ($)
$ / shares
shares
Mar. 31, 2023
shares
Mar. 31, 2023
shares
Stock Issued During Period, Shares, New Issues 215,625        
Warrants and Rights Outstanding, Term       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
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
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    
Registered Direct Offering October 2019 [Member]          
Stock Issued During Period, Shares, New Issues   71,429