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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, Rate in Thousands, $ in Thousands
1 Months Ended 3 Months Ended
Feb. 29, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Dec. 31, 2021
May 14, 2021
Jul. 31, 2016
Oct. 27, 2014
Preferred Stock, Shares Authorized (in shares)   1,000,000   1,000,000        
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001   $ 0.001        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 500            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 8 months 12 days            
Warrants Exercisable Term (Month)   6 months            
Warrants and Rights Outstanding, Term (Year)   5 years            
Warrants or Rights, Exercised During Period (in shares)   0 0          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value   $ 0            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)   8 years 1 month 6 days            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)   7 years 7 months 6 days            
Share-Based Payment Arrangement, Option [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)   1,802,479   1,831,515        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   0            
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 0            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate)   0.00%            
Share-Based Payment Arrangement, Option [Member] | Subsequent Event [Member] | Vesting Quarterly [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 250,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years              
Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.83              
Share-Based Payment Arrangement, Employee [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   0 50,000          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     $ 1.34          
Share-Based Payment Arrangement, Employee [Member] | Share-Based Payment Arrangement, Option [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years          
Montage Warrant [Member]                
Warrants and Rights Outstanding, Term (Year)   8 years            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 132.5            
Class of Warrant or Right, Equity Buy-out   $ 250            
Series A Warrants [Member]                
Warrants and Rights Outstanding, Term (Year)         5 years 6 months      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 4      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   872,625            
Series B Warrants [Member]                
Warrants and Rights Outstanding, Term (Year)         24 months      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 4      
Series C Warrants [Member]                
Warrants and Rights Outstanding, Term (Year)         5 years 6 months      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 0.05      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   13,738            
Placement Agent Warrants [Member]                
Warrants and Rights Outstanding, Term (Year)           5 years    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 4 $ 2.85    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   179,536       179,536    
Series C Preferred Placement Agent Warrants [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   11,992            
Series D Preferred Stock Warrants [Member]                
Warrants and Rights Outstanding, Term (Year)           5 years 6 months    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 2.51    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           592,106    
Series D Warrants [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   592,106            
Warrants or Rights, Exercised During Period (in shares)   0            
Amended and Restated Stock Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   2,400,000         5,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)   1,802,479            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   344,000            
Series A Convertible Preferred Stock [Member]                
Preferred Stock, Shares Authorized (in shares)               264,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)               $ 10
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   0   0        
Series B Convertible Preferred Stock [Member]                
Preferred Stock, Shares Authorized (in shares)   5,000            
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 1,000            
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   0   0        
Series C Convertible Preferred Stock [Member]                
Preferred Stock, Shares Authorized (in shares)   11,000   11,000        
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 1,000            
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   350   350        
Preferred Stock, Convertible, Shares Issuable (in shares)   38,889   38,889        
Series D Convertible Preferred Stock [Member]                
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 1,000    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   0   0   4,200    
Convertible Preferred Stock, Percent, Maximum Ownership           4.99%    
Convertible Preferred Stock, Percent, Maximum Ownership Upon Election           9.99%