Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Preferred Stock (Details Textual)

v3.21.1
Note 10 - Preferred Stock (Details Textual)
3 Months Ended 16 Months Ended
Jan. 19, 2021
shares
Nov. 26, 2019
Nov. 12, 2019
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
shares
Dec. 16, 2020
shares
Dec. 15, 2020
shares
Preferred Stock, Shares Authorized (in shares)       10,000,000   10,000,000 10,000,000 [1]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       9,793,605   9,793,605      
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            
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 Preferred Stock [Member]                  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       0   0   0  
Preferred Stock, Shares Authorized (in shares)                 547,345
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)       1   1      
Series B Preferred Stock [Member]                  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       36,937 32,677 36,937 35,819 [1]    
Preferred Stock, Dividend Rate, Percentage   12.50%              
Preferred Stock Dividends, Shares (in shares)       1,118 989 5,637      
Dividends, Preferred Stock, Cash | $       $ 1,000 $ 1,000 $ 12,000      
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)       2,414,183 2,135,098 2,414,183 2,341,111    
Conversion of Stock Exchange Ratio       65.36          
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares       $ 1,000   $ 1,000      
Conversion of Stock, Conversion Rate (in dollars per share) | $ / shares       $ 15.30   $ 15.30      
Series C Preferred Stock [Member]                  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       0   0      
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)       1   1      
Conversion of Stock Exchange Ratio       1          
Series C Preferred Stock [Member] | January 2021 Offering [Member]                  
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 1     1   1      
Stock Issued During Period, Shares, New Issues (in shares) 2,450,880                
[1] The condensed consolidated balance sheet as of December 31, 2020 has been derived from the audited consolidated financial statements as of that date.