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Note 1 - Basis of Presentation and General Information (Details Textual)
 1 Months Ended 12 Months Ended
Feb. 01, 2021
Dec. 19, 2019
Dec. 18, 2019
Nov. 21, 2019
USD ($)
$ / shares
Nov. 08, 2019
USD ($)
Jul. 29, 2019
USD ($)
Jun. 10, 2019
Jan. 31, 2021
Aug. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 30, 2018
shares
Shareholders Ownership, Percentage                   62.00%      
Spinoff Transaction, Number of Eurodry Common Share Received by Company’s Shareholders for Every Five Common Shares (in shares) | shares                         1
Spinoff Transaction, Number of Company’s Common Shares Exchanged for Each Common Share of Eurodry (in shares) | shares                         5
Payments to Acquire Property, Plant, and Equipment, Total                   $ 55,720,226 $ 1,867 $ 30,063,480  
Proceeds from Issuance of Long-term Debt, Total                 $ 16,167,680        
Working Capital Surplus                   18,600,000      
Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total                   3,240,429 $ (1,474,830) $ 5,053,025  
Cash, Ending Balance                   1,000,000      
Restricted Cash and Cash Equivalents, Total                   $ 4,900,000      
Series B Preferred Stock [Member]                          
Preferred Stock, Dividend Rate, Percentage             4.00%     8.00%      
Series B Preferred Stock [Member] | Forecast [Member]                          
Preferred Stock, Dividend Rate, Percentage 14.00%             14.00%          
Reverse Stock Split [Member]                          
Stockholders' Equity Note, Stock Split, Conversion Ratio   8 8                    
Piraeus Bank S.A. [Member]                          
Proceeds from Issuance of Long-term Debt, Total           $ 3,667,680              
Piraeus Bank S.A. [Member] | Second Debt Agreement [Member]                          
Proceeds from Issuance of Long-term Debt, Total         $ 32,000,000                
Four Feeder Containerships [Member]                          
Number of Vessels Acquired                 4        
Consideration to Acquire Property, Plant and Equipment                 $ 28,200,000        
Payments to Acquire Property, Plant, and Equipment, Total                 $ 15,000,000        
Stock Issued During Period, Shares, Purchase of Assets (in shares) | shares                 2,816,901 2,816,901      
Shares Issued, Percent of Outsanding Shares of the Company                 64.30%        
Synergy Vessels [Member]                          
Payments to Acquire Property, Plant, and Equipment, Total       $ 2,000,000                  
Stock Issued During Period, Shares, Purchase of Assets (in shares) | shares                   1,056,338      
Vessels Acquired During the Period       4                  
Proceeds from Issuance of Private Placement       $ 6,000,000                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 5.68                  
Acquisition of Property, Plant and Equipment, Contingent Shares Issuable       $ 500,000                  
Synergy Vessels [Member] | Piraeus Bank S.A. [Member] | Second Debt Agreement [Member]                          
Proceeds from Issuance of Debt       $ 32,000,000