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Note 18 - Other Operating Income (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2017
Other Operating Expenses, Income from Collection of Previously Written off Accounts $ 2,730,000 $ 1,610,000 $ 200,000  
Other Operating Expenses, Income $ 2,727,114 1,610,000 1,298,318  
Other Operating Expense (Income) From Settlement of Acccounts With Charterers   350,000    
M/V Manolis P [Member]        
Other Operating Expenses, Income     1,000,000  
M/V Akinada Bridge [Member]        
Other Operating Income Related to Unrepaired Damage Claim   $ 1,960,000    
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Settled Litigation [Member] | Alterwall Business Inc. [Member]        
Payments for Legal Settlements     60,000.00  
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Pending Litigation [Member] | Alterwall Business Inc. [Member]        
Gain (Loss) Related to Litigation Settlement, Total     $ 100,000  
Estimated Litigation Liability       $ 150,000