Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Capitalization and Equity Structure (Details Textual)

v3.23.2
Note 12 - Capitalization and Equity Structure (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2021
Oct. 31, 2020
Jun. 30, 2020
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Jun. 08, 2020
Dec. 31, 2019
Jun. 30, 2019
May 31, 2019
Common Stock, Shares Authorized (in shares)         141,429,000   141,429,000        
Preferred Stock, Shares Authorized (in shares)         10,000,000   10,000,000        
Common Stock, Shares, Outstanding (in shares)         13,807,000   13,203,000        
Preferred Stock, Shares Outstanding (in shares)         0   0        
Class Of Warrant Or Right Issued (in shares)         0            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                    
Class of Warrant or Right Expiration Period (Year) 5 years                    
Class of Warrant or Right, Outstanding (in shares)         1,240   1,240        
A2021 Warrants [Member]                      
Class Of Warrant Or Right Issued (in shares) 273,000       0            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 12.81       $ 12.81            
Class of Warrant or Right, Outstanding (in shares)         273   273        
Warrants and Rights Outstanding, Term (Year)         5 years            
June 2020 Investor Warrants [Member]                      
Class Of Warrant Or Right Issued (in shares)         0            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 5.18   $ 5.18     $ 5.18      
Class of Warrant or Right, Outstanding (in shares)     874,000   127   127        
Class of Warrant or Right Expiration Period (Year)     5 years 6 months                
Warrants and Rights Outstanding, Term (Year)         5 years 6 months            
Shares Issued, Price Per Share (in dollars per share)               4.51      
June 2020 Placement Agent Warrants [Member]                      
Class Of Warrant Or Right Issued (in shares)     122,000   0            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 5.64   $ 5.64            
Class of Warrant or Right, Outstanding (in shares)         39   39        
Warrants and Rights Outstanding, Term (Year)         5 years            
December 2019 Warrants [Member]                      
Class Of Warrant Or Right Issued (in shares)         0            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 8.10         $ 8.10  
Class of Warrant or Right, Outstanding (in shares)         556   556     556,000  
Warrants and Rights Outstanding, Term (Year)         5 years         5 years  
December 2019 Placement Agent Warrants [Member]                      
Class Of Warrant Or Right Issued (in shares)         0            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 8.44       $ 8.44    
Class of Warrant or Right, Outstanding (in shares)         52   52   52,000    
Warrants and Rights Outstanding, Term (Year)         5 years            
May 2019 Warrants [Member]                      
Class Of Warrant Or Right Issued (in shares)         0            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 3.52     $ 3.52     $ 3.52
Class of Warrant or Right, Outstanding (in shares)         193   193       444,000
Warrants and Rights Outstanding, Term (Year)         5 years           5 years
Common Stock [Member]                      
Class Of Warrant Or Warrants Exercised (in shares)       0 0 0          
At the Market Offering [Member]                      
Sale of Stock, Consideration Received on Transaction   $ 7.5                  
Sale of Stock, Price Per Share (in dollars per share)   $ 6.75                  
Sale of Stock, Number of Shares Issued in Transaction (in shares)         0