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Note 10 - Loss Per Common Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Loss attributable to common shareholders $ (628) $ (6,624)
Less: Deemed dividend for beneficial conversion feature of Series E Shares (9,339)
Less: Dividend equivalents on Series E Shares related to redemption value (4,223)
Less: Dividend of Series E Shares (1,029)
Loss attributable to common shareholders $ (15,219) $ (6,624)
Loss per share:    
Weighted average common shares outstanding, basic (in shares) 1,313,102 781,027
Weighted average common shares outstanding, diluted (in shares) 1,313,102 781,027
Loss per share, basic and diluted (in dollars per share) $ (11.59) $ (8.48)
Warrant [Member]    
Loss per share:    
Dilutive securities (in shares)
Preferred Stock [Member] | Series E Preferred Stock [Member]    
Loss per share:    
Dilutive securities (in shares)