Annual report pursuant to Section 13 and 15(d)

Note 11 - Preferred Stock (Details Textual)

v3.20.4
Note 11 - Preferred Stock (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended 24 Months Ended
Nov. 26, 2019
Nov. 12, 2019
Nov. 30, 2019
Feb. 29, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 16, 2020
Preferred Stock, Shares Authorized (in shares)         10,000,000 10,000,000 10,000,000 10,000,000  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         2,473,785   2,473,785    
Warrants Issued Upon Conversion of Term Loan with CRG [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   989,379     741,940   741,940    
Conversion of Term Loan with CRG Into Series B Convertible Preferred Stock [Member]                  
Debt Conversion, Converted Instrument, Shares Issued (in shares)   31,300              
Series A Convertible Preferred Stock Into Common Stock [Member]                  
Conversion of Stock, Shares Converted (in shares)       185,218 362,127        
Series A Preferred Stock [Member]                  
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)     1   1 1 1 1  
Stock Issued During Period, Shares, New Issues (in shares)     547,345            
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         185,218 0 185,218 0 0
Preferred Stock, Shares Authorized (in shares)           547,345   547,345 547,345
Series B Preferred Stock [Member]                  
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)         270,458 2,341,111 270,458 2,341,111  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         31,678 35,819 31,678 35,819  
Preferred Stock, Dividend Rate, Percentage 12.50%                
Preferred Stock Dividends, Shares (in shares)           4,141 378 4,519  
Dividends, Preferred Stock, Cash           $ 8,000 $ 2,000 $ 10,000  
Preferred Stock, Fair Value, Per Share (in dollars per share) $ 1,023.23                
Convertible Preferred Stock, Fair Value $ 32,027,000                
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares) 31,300