Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Stockholders' Equity (Details Textual)

v3.22.2.2
Note 9 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended
Jun. 22, 2022
Jun. 25, 2021
May 20, 2021
Aug. 31, 2021
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Common Stock, Shares Authorized (in shares)         300,000,000 300,000,000  
Common Stock, Shares, Outstanding, Ending Balance (in shares)         74,406,253 72,222,661  
Common Stock, Shares, Issued (in shares)         74,406,253 72,222,661  
Common Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001 $ 0.001  
Preferred Stock, Shares Authorized (in shares)         10,000,000 10,000,000  
Preferred Stock, Shares Issued (in shares)         15,617    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         15,617 15,617  
Preferred Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001 $ 0.001  
Jefferies L L C [Member] | At the Market Offering [Member]              
Sale of Stock, Authorized Amount       $ 50.0      
Stock Issued During Period, Shares, New Issues (in shares)         2.1    
Stock Issued During Period, Value, Issued for Services         $ 7.2    
Shares Issued, Price Per Share (in dollars per share)         $ 3.46    
Conversion of Common Stock into Series E Preferred Stock [Member]              
Conversion of Stock, Shares Converted (in shares)     5,000,000        
Conversion of Stock, Shares Issued (in shares)     5,000        
Employee Director And Consultant Equity Incentive Plan2020 [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)             3,500,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 3,000,000 2,250,000          
Employee Director And Consultant Equity Incentive Plan 2019 [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)             1,579,678
Series A Preferred Stock [Member]              
Preferred Stock, Shares Issued (in shares)         85 85  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         85 85  
Series B Preferred Stock [Member]              
Preferred Stock, Shares Issued (in shares)         4,026 4,026  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         4,026 4,026  
Series C Preferred Stock [Member]              
Preferred Stock, Shares Issued (in shares)         3,506 3,506  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         3,506 3,506  
Series D Preferred Stock [Member]              
Preferred Stock, Shares Issued (in shares)         3,000 3,000  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         3,000 3,000  
Series E Preferred Stock [Member]              
Preferred Stock, Shares Authorized (in shares)     5,000        
Preferred Stock, Shares Issued (in shares)         5,000 5,000  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         5,000 5,000