v3.22.2.2
Note 12 - Warrants (Details Textual)
9 Months Ended
Aug. 03, 2022
USD ($)
$ / shares
shares
Nov. 15, 2021
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
May 30, 2019
USD ($)
yr
$ / shares
shares
Proceeds from Issuance of Common Stock     $ 192,000 $ 36,360,000  
Securities Purchase Agreement [Member]          
Proceeds from Issuance or Sale of Equity, Total $ 300,000        
Proceeds from Issuance or Sale of Equity, Net $ 200,000        
2021 Registered Direct Offering [Member]          
Proceeds from Issuance or Sale of Equity, Total   $ 14,000,000.0      
2021 Registered Direct Offering [Member] | Measurement Input, Risk Free Interest Rate [Member]          
Proceeds from Issuance of Common Stock   8,400,000      
2021 Registered Direct Offering [Member] | Measurement Input, Expected Dividend Rate [Member]          
Proceeds from Issuance or Sale of Equity, Total   $ 14,000,000.0      
August 2022 LPC Warrant [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 81,150        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 4.07        
Warrants and Rights Outstanding $ 300,000        
Proceeds from Issuance or Sale of Equity, Net $ 110,000        
August 2022 LPC Warrant [Member] | Measurement Input, Exercise Price [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 4.07        
August 2022 LPC Warrant [Member] | Measurement Input, Share Price [Member]          
Warrants and Rights Outstanding, Measurement Input 4.44        
August 2022 LPC Warrant [Member] | Measurement Input, Expected Term [Member]          
Warrants and Rights Outstanding, Measurement Input 5.5        
August 2022 LPC Warrant [Member] | Measurement Input, Price Volatility [Member]          
Warrants and Rights Outstanding, Measurement Input 0.8994        
August 2022 LPC Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]          
Warrants and Rights Outstanding, Measurement Input 0.0286        
August 2022 LPC Warrant [Member] | Measurement Input, Expected Dividend Rate [Member]          
Warrants and Rights Outstanding, Measurement Input 0        
November 2021 Financing Warrants [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares   875,000      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares   875,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 20.00      
Warrants and Rights Outstanding   $ 8,600,000      
Proceeds from Issuance of Warrants   $ 5,600,000      
November 2021 Financing Warrants [Member] | Maximum [Member]          
Class of Warrant or Right, Required Percentage of Ownership to Become Exercisable   9.99%      
November 2021 Financing Warrants [Member] | Measurement Input, Exercise Price [Member]          
Warrants and Rights Outstanding, Measurement Input   20.00      
November 2021 Financing Warrants [Member] | Measurement Input, Share Price [Member]          
Warrants and Rights Outstanding, Measurement Input   14.92      
November 2021 Financing Warrants [Member] | Measurement Input, Expected Term [Member]          
Warrants and Rights Outstanding, Measurement Input   5      
November 2021 Financing Warrants [Member] | Measurement Input, Price Volatility [Member]          
Warrants and Rights Outstanding, Measurement Input   0.9177      
November 2021 Financing Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]          
Warrants and Rights Outstanding, Measurement Input   0.0126      
November 2021 Financing Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]          
Warrants and Rights Outstanding, Measurement Input   0      
Warrant In Connection with Oxford Finance Loan Agreement [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares         8,833
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 56.60
Warrants and Rights Outstanding         $ 400,000
Warrants and Rights Outstanding, Term (Year)         10 years
Class of Warrant or Right, Outstanding (in shares) | shares     8,833    
Warrant In Connection with Oxford Finance Loan Agreement [Member] | Measurement Input, Exercise Price [Member]          
Warrants and Rights Outstanding, Measurement Input         56.60
Warrant In Connection with Oxford Finance Loan Agreement [Member] | Measurement Input, Share Price [Member]          
Warrants and Rights Outstanding, Measurement Input         53.20
Warrant In Connection with Oxford Finance Loan Agreement [Member] | Measurement Input, Expected Term [Member]          
Warrants and Rights Outstanding, Measurement Input | yr         10
Warrant In Connection with Oxford Finance Loan Agreement [Member] | Measurement Input, Price Volatility [Member]          
Warrants and Rights Outstanding, Measurement Input         0.8022
Warrant In Connection with Oxford Finance Loan Agreement [Member] | Measurement Input, Risk Free Interest Rate [Member]          
Warrants and Rights Outstanding, Measurement Input         0.0222
Warrant In Connection with Oxford Finance Loan Agreement [Member] | Measurement Input, Expected Dividend Rate [Member]          
Warrants and Rights Outstanding, Measurement Input         0
Redeemable Convertible Preferred Stock [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares 3,000        
Proceeds from Issuance or Sale of Equity, Net $ 129,000