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Note 6 - Related Party Transactions (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2018
Mar. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2022
EUR (€)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Nov. 01, 2019
USD ($)
Service Management Costs Daily Fee Related Party | €       € 720   € 685 € 685    
Related Party Agreement Term (Year) 5 years                
Related Party Transaction Discount Percentage 5.00%                
Due to Related Parties, Total     $ 100,564         $ 309,970  
Eurobulk Ltd. [Member] | Fixed Management Fees [Member]                  
Related Party Transaction, Amounts of Transaction     1,000,000   $ 1,000,000        
Eurobulk Ltd. [Member] | Vessel Management Fees [Member]                  
Related Party Transaction, Amounts of Transaction     2,345,944   2,148,221        
Eurochart [Member] | Vessel Sales [Member]                  
Due to Related Parties, Total     $ 350,000            
Related Party Transaction Commission, Percentage     1.00% 1.00%          
Eurochart [Member] | Charter Revenues [Member]                  
Related Party Transaction Commission, Percentage     1.25% 1.25%          
Related Party Transaction, Expenses from Transactions with Related Party     $ 1,218,107   338,985        
Sentinel [Member]                  
Related Party Transaction, Expenses from Transactions with Related Party     $ 59,834   42,998        
Related Party Transaction Commission on Premium, Maximum, Percentage     5.00% 5.00%          
Technomar [Member]                  
Related Party Transaction, Expenses from Transactions with Related Party     $ 121,600   $ 65,997        
Related Party Transaction Amounts of Transaction Per Crew Member Per Month     $ 50            
Colby Trading Ltd [Member] | First Debt Agreement [Member]                  
Due to Related Parties, Total                 $ 2,500,000
Debt Instrument, Interest Rate, Stated Percentage                 8.00%
Repayments of Long-Term Debt, Total   $ 50,000