Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Capitalization and Equity Structure (Details Textual)

v3.24.3
Note 11 - Capitalization and Equity Structure (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 03, 2024
Jan. 10, 2024
Sep. 30, 2024
Feb. 28, 2021
Oct. 31, 2020
Jun. 30, 2020
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2019
Jun. 30, 2019
May 31, 2019
Common Stock, Shares Authorized (in shares)     141,429,000       141,429,000         141,429,000   141,429,000      
Preferred Stock, Shares Authorized (in shares)     10,000,000       10,000,000         10,000,000   10,000,000      
Common Stock, Shares, Outstanding (in shares)     21,998,000       21,998,000         21,998,000   14,848,000      
Preferred Stock, Shares Outstanding (in shares)     0       0         0   0      
Proceeds from Issuance of Common Stock                       $ 9,021 $ 0        
Stock Issued During Period, Value, New Issues               $ 47 $ 3,970                
Class Of Warrant Or Right Issued (in shares)                       14,900,000          
Class of Warrant or Right, Outstanding (in shares)     15,612,000       15,612,000         15,612,000   1,240,000      
Common Stock, Shares, Issued (in shares)     21,998,000       21,998,000         21,998,000   14,848,000      
Preferred Stock, Shares Issued (in shares)     0       0         0   0      
September 2024 Pre-funded Warrants [Member]                                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 2,900   2,900       2,900         2,900          
Shares Issued, Price Per Share (in dollars per share)     $ 1       $ 1         $ 1          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 0.001       $ 0.001         $ 0.001          
Proceeds from Issuance of Warrants     $ 2,897                            
Class Of Warrant Or Right Issued (in shares)                       2,900          
Class of Warrant or Right, Outstanding (in shares)     2,565       2,565         2,565   0      
September 2024 Series A Warrants [Member]                                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 6,000   6,000       6,000         6,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 1       $ 1         $ 1          
Class Of Warrant Or Right Issued (in shares)                       6,000          
Class of Warrant or Right, Outstanding (in shares)     6,000       6,000         6,000   0      
Warrants and Rights Outstanding, Term (Year)     4 years 10 months 24 days       4 years 10 months 24 days         4 years 10 months 24 days          
September 2024 Series B Warrants [Member]                                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 6,000   6,000       6,000         6,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 1       $ 1         $ 1          
Class Of Warrant Or Right Issued (in shares)                       6,000          
Class of Warrant or Right, Outstanding (in shares)     6,000       6,000         6,000   0      
Warrants and Rights Outstanding, Term (Year)     10 months 24 days       10 months 24 days         10 months 24 days          
September 2024 Warrants [Member]                                  
Beneficial Ownership Limitation, Percentage     4.99%                            
Beneficial Ownership Limitation, Contingency, Percentage Increase Available for Grant     9.99%                            
A2021 Warrants [Member]                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 12.81 $ 12.81     $ 12.81         $ 12.81          
Beneficial Ownership Limitation, Contingency, Percentage Increase Available for Grant                       9.99%          
Class Of Warrant Or Right Issued (in shares)       273,000               0          
Class of Warrant or Right, Outstanding (in shares)     273,000       273,000         273,000   273,000      
Warrants and Rights Outstanding, Term (Year)     1 year 4 months 24 days       1 year 4 months 24 days         1 year 4 months 24 days          
June 2020 Investor Warrants [Member]                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 5.18     $ 5.18 $ 5.18         $ 5.18          
Beneficial Ownership Limitation, Contingency, Percentage Increase Available for Grant                       9.99%          
Class Of Warrant Or Right Issued (in shares)                       0          
Class of Warrant or Right, Outstanding (in shares)     127,000     874,000 127,000         127,000   127,000      
Warrants and Rights Outstanding, Term (Year)     1 year 2 months 12 days       1 year 2 months 12 days         1 year 2 months 12 days          
June 2020 Placement Agent Warrants [Member]                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 5.64     $ 5.64 $ 5.64         $ 5.64          
Class Of Warrant Or Right Issued (in shares)           122,000           0          
Class of Warrant or Right, Outstanding (in shares)     39,000       39,000         39,000   39,000      
Warrants and Rights Outstanding, Term (Year)     8 months 12 days       8 months 12 days         8 months 12 days          
December 2019 Warrants [Member]                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 8.1       $ 8.1         $ 8.1       $ 8.1  
Beneficial Ownership Limitation, Contingency, Percentage Increase Available for Grant                       9.99%          
Class Of Warrant Or Right Issued (in shares)                       0          
Class of Warrant or Right, Outstanding (in shares)     556,000       556,000         556,000   556,000   556,000  
Warrants and Rights Outstanding, Term (Year)     8 months 12 days       8 months 12 days         8 months 12 days          
December 2019 Placement Agent Warrants [Member]                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 8.44       $ 8.44         $ 8.44     $ 8.44    
Class Of Warrant Or Right Issued (in shares)                       0          
Class of Warrant or Right, Outstanding (in shares)     52,000       52,000         52,000   52,000 52,000    
Warrants and Rights Outstanding, Term (Year)     2 months 12 days       2 months 12 days         2 months 12 days          
May 2019 Warrants [Member]                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 1.55       $ 1.55         $ 1.55          
Class Of Warrant Or Right Issued (in shares)                       0          
Class of Warrant or Right, Outstanding (in shares)     0       0         0   193,000     444,000
Warrants and Rights Outstanding, Term (Year)                                 5 years
September 2024 Offering [Member]                                  
Stock Issued During Period, Shares, New Issues (in shares) 3,100                                
Proceeds from Issuance or Sale of Equity $ 5,004                                
Stock Issued During Period, Value, New Issues             $ 5,004                    
January 2024 Offering [Member]                                  
Stock Issued During Period, Shares, New Issues (in shares)   2,968,000                              
Shares Issued, Price Per Share (in dollars per share)   $ 1.55                              
Proceeds from Issuance of Common Stock   $ 3,932                              
At the Market Offering [Member]                                  
Stock Issued During Period, Shares, New Issues (in shares)             0     0 105,000            
Proceeds from Issuance of Common Stock                     $ 85            
Stock Issued During Period, Value, New Issues         $ 5,000                        
Shares Issued, Average Price Per Share (in dollars per share)                     $ 1.43            
Sale Of Stock, Stock Available For Issuance, Value                     $ 4,134            
At the Market Offering [Member] | Minimum [Member]                                  
Share Price (in dollars per share)         $ 6.75