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Note 7 - Other Operating (Income) / Expenses (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Feb. 29, 2020
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2017
Other Operating Expenses, Income     $ (350,000) $ 1,296,496  
Other Operating Expenses, Income from Collection of Previously Written off Accounts       200,000  
Other Operating Expense (Income) From Settlement of Acccounts With Charterers     $ 350,000    
M/V Manolis P [Member]          
Advance Received for Vessel Held for Sale $ 1,133,817        
Other Operating Expenses, Income       1,000,000.0  
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Settled Litigation [Member] | Alterwall Business Inc. [Member]          
Restricted Cash and Investments, Total   $ 530,000   530,000  
Increase (Decrease) in Restricted Investments for Operating Activities, Total       (530,000)  
Estimated Litigation Liability   150,000   150,000  
Payments for Legal Settlements   60,000.00      
Litigation Settlement, Expense   $ 10,000.00      
Gain (Loss) Related to Litigation Settlement       $ 80,000.00  
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Pending Litigation [Member] | Alterwall Business Inc. [Member]          
Estimated Litigation Liability         $ 150,000