Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Preferred Stock (Details Textual)

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Note 10 - Preferred Stock (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 26, 2019
Nov. 12, 2019
Feb. 29, 2020
Jan. 31, 2020
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Nov. 30, 2019
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         23,583,290 23,583,290    
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) 9,893,776 9,893,776            
Conversion of Term Loan with CRG Into Series B Convertible Preferred Stock [Member]                
Debt Conversion, Converted Instrument, Shares Issued (in shares) 31,300 31,300            
Series A Convertible Preferred Stock Into Common Stock [Member]                
Conversion of Stock, Shares Converted (in shares)     669,022 1,183,151        
Series A Preferred Stock [Member]                
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)         1 1   1
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         0 0 1,852,173  
Series A Convertible Preferred Stock [Member]                
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         0 0    
Series B Preferred Stock [Member]                
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)         22,016,179 22,016,179    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         33,685 33,685 31,678 [1]  
Preferred Stock, Dividend Rate, Percentage 12.50%              
Preferred Stock Dividends, Shares (in shares)         1,018 2,007 378  
Dividends, Preferred Stock, Cash         $ 3,000 $ 4,000 $ 2,000  
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              
[1] The condensed consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date.