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Note 5 - Transactions With Related Parties - Fees Charged by Related Parties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Central Mare [Member]    
Related Party Transaction, Amounts of Transaction $ 163 $ 163
Central Mare [Member] | Executive Officers and Other Personnel Expenses [Member] | General and Administrative Expense [Member]    
Related Party Transaction, Amounts of Transaction 180 180
Central Mare [Member] | Amortization of Awarded Shares [Member] | Management Fees Related Party [Member]    
Related Party Transaction, Amounts of Transaction (17) (17)
Central Shipping Monaco SAM [Member]    
Related Party Transaction, Amounts of Transaction 3,163 6,754
Central Shipping Monaco SAM [Member] | Management Fees [Member] | Vessels, Net [Member]    
Fees charged 99 31
Central Shipping Monaco SAM [Member] | Supervision Fee [Member] | Vessels, Net [Member]    
Fees charged 27 22
Central Shipping Monaco SAM [Member] | Supervision Fee [Member] | Management Fees - Related Parties [Member]    
Related Party Transaction, Amounts of Transaction 705 1,063
Central Shipping Monaco SAM [Member] | Superintendent Fees [Member] | Vessels, Net [Member]    
Fees charged 178 73
Central Shipping Monaco SAM [Member] | Superintendent Fees [Member] | Vessel Operating Expenses [Member]    
Related Party Transaction, Amounts of Transaction 13 49
Central Shipping Monaco SAM [Member] | Accounting and Reporting Cost [Member] | Management Fees - Related Parties [Member]    
Related Party Transaction, Amounts of Transaction 180 150
Central Shipping Monaco SAM [Member] | Commission for Sale and Purchase of Vessels [Member]    
Fees charged 702 453
Central Shipping Monaco SAM [Member] | Commission for Sale and Purchase of Vessels [Member] | Management Fees - Related Parties [Member]    
Related Party Transaction, Amounts of Transaction 793 3,377
Central Shipping Monaco SAM [Member] | Commission for Sale and Purchase of Vessels [Member] | Gain From Vessel Sales [Member]    
Related Party Transaction, Amounts of Transaction 0 1,123
Central Shipping Monaco SAM [Member] | Commissions on Charter Hire Agreements [Member] | Voyage Expenses [Member]    
Related Party Transaction, Amounts of Transaction 316 413
Central Shipping Monaco SAM [Member] | Financing Fees [Member] | Long-term Debt [Member]    
Financing fees $ 150 $ 0