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Note 12 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, Rate in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Sep. 30, 2022
Dec. 31, 2021
May 14, 2021
Oct. 17, 2018
Aug. 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 Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 2,107,895                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 400                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 4 months 24 days                
Warrants Exercisable Term (Month) 6 months                
Warrants and Rights Outstanding, Term (Year) 5 years                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 330,000                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares) 1,543,890 1,148,097              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value $ 105,000 $ 0              
Share-Based Payment Arrangement, Employee [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   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              
Board of Directors [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   200,000              
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 1.18              
Share-Based Payment Arrangement, Option [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 2,107,895 1,831,515   1,157,927          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 330,000 702,000              
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 0.83 $ 1.19              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate) 0.00%                
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   152,000              
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 1.18              
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        
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        
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      
Warrants or Rights, Exercised During Period (in shares) 0 0              
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                
Director [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 2,107,895                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 38,940                
Director [Member] | Share-Based Payment Arrangement, Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate) 0.00% 0.00%              
Management [Member] | Share-Based Payment Arrangement, Option [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 Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 0.81                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years                
Board Member [Member] | Share-Based Payment Arrangement, Option [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 80,000                
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 0.9                
Chief Executive Officer [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   300,000              
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 1.18              
Chief Executive Officer [Member] | Share-Based Payment Arrangement, Option [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   3 years              
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  
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 (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 (in shares) 0 0              
Series C Convertible Preferred Stock [Member]                  
Preferred Stock, Shares Authorized (in shares) 11,000 11,000         11,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share)             $ 1,000    
Preferred Stock, Shares Outstanding (in shares) 350 350              
Preferred Stock, Convertible, Shares Issuable (in shares) 38,889 38,889              
Series D Convertible Preferred Stock [Member]                  
Preferred Stock, Shares Authorized (in shares) 4,200 4,200       4,200      
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 1,000      
Preferred Stock, Shares Outstanding (in shares) 0 0              
Convertible Preferred Stock, Percent, Maximum Ownership           4.99%      
Convertible Preferred Stock, Percent, Maximum Ownership Upon Election           9.99%