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Note 7 - Credit Facility, Term Loans and Warrants (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
Mar. 01, 2022
Dec. 22, 2021
Sep. 30, 2024
Mar. 20, 2024
Feb. 23, 2024
Dec. 31, 2023
Aug. 11, 2023
Dec. 22, 2022
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   16,667            
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.0001 $ 0.0001 $ 0.0001   $ 0.0001 $ 0.0001  
Warrant Liability $ 19.0   $ 0.3          
Securities Purchase Agreement [Member] | Private Placement [Member]                
Stock Issued During Period, Shares, New Issues (in shares) 536,361              
Stock and Warrants, Combined Issuance Price (in dollars per share) $ 34.92              
Proceeds from Issuance or Sale of Equity $ 27.5              
Midcap Warrant [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 56.4            
Warrants and Rights Outstanding, Term (Year)   10 years            
Common Stock Warrants and Prefunded Warrants [Member] | Securities Purchase Agreement [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 402,271              
Class of Warrant or Right, Sale Price (in dollars per share) $ 34.92              
Prefunded Warrants [Member] | Securities Purchase Agreement [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 251,155              
Common Stock Warrant [Member] | Securities Purchase Agreement [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 188,366              
Line of Credit [Member] | Midcap Credit Facility [Member]                
Debt Instrument, Term (Year)   3 years            
Line of Credit Facility, Maximum Borrowing Capacity   $ 40.0     $ 30.0      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.50%            
Line Of Credit Facility, Maximum Liquidity Requirements During Period   $ 12.5            
Line Of Credit Facility, Maximum Liquidity Requirements At All Other Times   $ 15.0     6.8     $ 15.0
Line of Credit Facility, Current Borrowing Capacity         17.0      
Line of Credit [Member] | Midcap Credit Facility [Member] | Term Secured Overnight Financing Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate   0.10%            
Line of Credit [Member] | Midcap Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate   5.50%            
Asset Backed Credit Facility [Member] | Midcap Credit Facility [Member] | Maximum [Member]                
Debt Instrument, Fee Amount         $ 0.1