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Note 9 - Common and Preferred Stock, Additional Paid-in Capital and Dividends (Details Textual)
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 7 Months Ended 12 Months Ended 24 Months Ended
Aug. 10, 2020
Aug. 07, 2020
Nov. 06, 2019
USD ($)
$ / shares
shares
Sep. 13, 2019
USD ($)
$ / shares
shares
Aug. 22, 2019
Oct. 26, 2018
USD ($)
$ / shares
shares
Mar. 26, 2018
May 08, 2017
USD ($)
$ / shares
shares
Mar. 11, 2020
USD ($)
shares
Jul. 24, 2018
USD ($)
shares
Jul. 06, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Jul. 31, 2019
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Feb. 12, 2020
USD ($)
Feb. 06, 2019
$ / shares
Jan. 11, 2019
$ / shares
Mar. 25, 2018
USD ($)
Stock Issued During Period, Value, New Issues | $                           $ 121,178,000              
Proceeds from Issuance of Common Stock | $                           129,660,000 $ 18,892,000 $ 5,781,000          
Proceeds from Warrant Exercises | $                           0 4,619,000 2,330,000          
Dividends, Total | $                           $ 0 $ 0 0          
Measurement Input, Price Volatility [Member]                                          
Warrants and Rights Outstanding, Measurement Input                           1.09              
Warrants Issued With the 2018 Common Stock Offering [Member]                                          
Class of Warrant or Right, Outstanding (in shares)           7,000                              
Class of Warrant or Right, Price Per Warrants or Rights (in dollars per share) | $ / shares           $ 0.01                              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares           $ 750                         $ 350 $ 510  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)           1                              
Proceeds from Warrant Exercises | $                                 $ 3,788,000        
Stock Issued During Period, Shares, Warrants Exercises (in shares)                                 7,000        
Warrants and Rights Outstanding | $           $ 1,671,000                              
Fair Value of Warrants, Percent Change in Fair Value From a 5% Change in Volatility           3.80%                              
Warrants Issued With the 2018 Common Stock Offering [Member] | Measurement Input, Price Volatility [Member]                                          
Warrants and Rights Outstanding, Measurement Input           1.08                              
The 2014 Warrants [Member]                                          
Proceeds from Warrant Exercises | $                         $ 3,161,000                
Stock Issued During Period, Shares, Warrants Exercises (in shares)                         13,481                
Class of Warrant or Right, Exercised During Period (in shares)                         1,268,000                
Traditional Warrants [Member]                                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares       $ 204.75                                  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)       0.040                                  
Stock Issued During Period, Shares, Warrants Exercises (in shares)                       49,803                  
Warrants and Rights Outstanding | $       $ 1,139,000                                  
Fair Value of Warrants, Percent Change in Fair Value From a 5% Change in Volatility       10.00%                                  
Class of Warrant or Right, Exercised During Period (in shares)                       1,778,700                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       71,600                                  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right, Cashless Exercise (in shares)       0.028                                  
Warrant Exercised on Cashless Basis Trigger, Underlining Number of Shares (in shares)       189,600                                  
Traditional Warrants [Member] | Measurement Input, Price Volatility [Member]                                          
Warrants and Rights Outstanding, Measurement Input       1.81                                  
Class A Warrants [Member]                                          
Class of Warrant or Right, Outstanding (in shares)                           4,200,000              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                           $ 50.00              
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)                           0.040              
Stock Issued During Period, Shares, Warrants Exercises (in shares)                           67,200              
Warrants and Rights Outstanding | $     $ 1,343,000                                    
Fair Value of Warrants, Percent Change in Fair Value From a 5% Change in Volatility     7.35%                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     168,000                                    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right, Cashless Exercise (in shares)                           0.016              
Warrant Exercised on Cashless Basis Trigger, Share Price (in dollars per share) | $ / shares                           $ 80.00              
Class A Warrants [Member] | Measurement Input, Price Volatility [Member]                                          
Warrants and Rights Outstanding, Measurement Input     1.27                                    
Class B Warrants [Member]                                          
Class of Warrant or Right, Outstanding (in shares)                       4,200,000   4,200,000 4,200,000   4,200,000        
Class of Warrant or Right, Price Per Warrants or Rights (in dollars per share) | $ / shares     $ 0.2373                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                       $ 25.00   $ 1.00 $ 25.00   $ 25.00        
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)                           0.040              
Warrants and Rights Outstanding | $                       $ 609,000   $ 66,000 $ 609,000   $ 609,000        
Class of Warrant or Right, Exercised During Period (in shares)                           0              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     168,000                 168,000   168,000 168,000   168,000        
Class B Warrants [Member] | Minimum [Member]                                          
Class of Warrant or Right, Outstanding (in shares)     4,200,000                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 1.00                     $ 1.00              
Class B Warrants [Member] | Measurement Input, Price Volatility [Member]                                          
Warrants and Rights Outstanding, Measurement Input     1.34                                    
Fair Value of Warrants, Percent Change in Fair Value From a 5% Change in Volatility     14.00%                                    
The 2018 Common Stock Offering [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)           4,000                              
Stock Issued During Period, Value, New Issues | $                               $ 2,721,000          
Shares Issued, Price Per Share (in dollars per share) | $ / shares           $ 750                              
Common Stock Purchase Agreement, Fee Percentage           6.50%                              
Proceeds from Issuance of Common Stock | $           $ 2,805,000                              
September 2019 Common Stock Offering [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)       63,200                                  
Stock Issued During Period, Value, New Issues | $                             $ 9,289,000            
Number of Shares Called by Overallotment Option (in shares)       9,480                                  
Proceeds from Issuance or Sale of Equity, Total | $       $ 10,480,000                                  
Over-Allotment Option [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)       3,400                                  
November 2019 Registered Direct Offering [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)     168,000                                    
Stock Issued During Period, Value, New Issues | $                             $ 7,642,000            
Shares Issued, Price Per Share (in dollars per share) | $ / shares     $ 50.00                                    
Proceeds from Issuance or Sale of Equity, Total | $     $ 8,400,000                                    
Equity Distribution Agreement [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                 2,693,191 4,981                      
Common Stock Purchase Agreement, Fee Percentage                 2.00% 2.00%                      
Proceeds from Issuance of Common Stock | $                 $ 9,800,000 $ 2,781,000                      
Common Stock Equity Distribution Agreement, Shares Authorized for Issuance, Value | $                 $ 5,000,000                 $ 5,000,000     $ 14,250,000
Registered Direct Offering [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)                     36,723,765                    
Proceeds from Issuance of Common Stock | $                     $ 112,146,000                    
Registered Direct Offering [Member] | Maximum [Member]                                          
Common Stock Purchase Agreement, Fee Percentage                     6.50%                    
Registered Direct Offering [Member] | Minimum [Member]                                          
Common Stock Purchase Agreement, Fee Percentage                     6.25%                    
Series D Preferred Stock [Member] | Tankers Family Inc. [Member]                                          
Stock Issued During Period, Shares, New Issues (in shares)               100,000                          
Stock Issued During Period, Value, New Issues | $               $ 1,000                          
Preferred Stock, Voting Rights Equivalent to Common Shares Per Share (in shares)               1,000                          
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares               $ 0.01                          
Series E Convertible Preferred Stock [Member]                                          
Convertible Preferred Stock, Conversion Price, Percentage of VWAP     80.00%                                    
Series E Convertible Preferred Stock [Member] | Maximum [Member]                                          
Convertible Preferred Stock, Conversion Price (in dollars per share) | $ / shares     $ 500.00                                    
Reverse Stock Split [Member]                                          
Stockholders' Equity Note, Stock Split, Conversion Ratio 25 25     20   10