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Note 15 - Preferred Shares (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 01, 2021
Jun. 10, 2019
Jan. 29, 2019
May 30, 2018
Jan. 27, 2014
Jan. 31, 2021
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Preferred Stock, Value, Distributed               $ 18,192,131  
Preferred Stock Distributed (in shares)               19,042  
Payments for Repurchase of Redeemable Preferred Stock             $ 11,686,000
Dividends, Paid-in-kind, Total             78,640 1,335,733 1,808,811
Dividends, Preferred Stock, Total             $ 1,271,782 1,335,733 1,808,811
Series B Preferred Stock [Member]                  
Proceeds from Issuance of Convertible Preferred Stock         $ 29,000,000        
Preferred Stock, Redemption Price Per Share (in dollars per share)         $ 1,000        
Preferred Stock, Dividend Rate, Percentage   4.00%         8.00%    
Preferred Stock Additional Cash Dividend Under Specified Conditions Percentage         40.00%        
Convertible Preferred Stock, Conversion Price Per Share (in dollars per share)         $ 15.58        
Payments for Repurchase of Redeemable Preferred Stock   $ 11,700,000              
Percentage of Outstanding Preferred Stock Redeemed   59.40%              
Preferred Stock, Value, Outstanding   $ 8,000,000              
Preferred Stock Deemed Dividend             $ 504,577    
Dividends, Paid-in-kind, Total             80,000 1,340,000 1,810,000
Dividends, Preferred Stock, Total             1,270,000    
Dividends, Preferred Stock, Cash             1,030,000    
Dividends Payable             160,000    
Preferred Stock, Redemption Amount             $ 8,000,000    
Preferred Stock Voting Percentage of Number of Shares Convertible of Common Stock             50.00%    
Series B Preferred Stock [Member] | Forecast [Member]                  
Preferred Stock, Dividend Rate, Percentage 14.00%         14.00%      
Series B Preferred Stock [Member] | Maximum [Member] | First Five Years [Member]                  
Preferred Stock, Dividend Rate, Percentage         5.00%        
Series B Preferred Stock [Member] | Maximum [Member] | Next Two Years [Member]                  
Preferred Stock, Dividend Rate, Percentage     12.00%            
Series B Preferred Stock [Member] | Maximum [Member] | After Two Years [Member]                  
Preferred Stock, Dividend Rate, Percentage     14.00%            
Ordinary Preferred Stock [Member]                  
Preferred Stock, Value, Distributed               14,500,000  
Preferred Stock Issued as Dividends [Member]                  
Preferred Stock, Value, Distributed               3,692,131  
TCP [Member] | Series B Preferred Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)         25,000        
Friends Investment Company Inc. [Member] | Series B Preferred Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)         5,700        
Eurodry [Member]                  
Percentage of Preferred Stock Outstanding             50.00%    
Preferred Stock, Value, Distributed             $ 18,192,131
Common Stock, Value, Distributed       $ 2,254,830          
Eurodry [Member] | Series B Preferred Stock [Member]                  
Preferred Stock Distributed (in shares)       19,042          
Eurodry [Member] | Ordinary Preferred Stock [Member]                  
Preferred Stock, Value, Distributed       $ 14,500,000          
Eurodry [Member] | Preferred Stock Issued as Dividends [Member]                  
Preferred Stock, Value, Distributed       $ 3,692,131