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Note 13 - Subsequent Events (Details Textual)
$ in Thousands
1 Months Ended
Sep. 08, 2021
USD ($)
shares
Sep. 01, 2021
USD ($)
Jul. 28, 2021
USD ($)
Aug. 23, 2021
USD ($)
Jan. 06, 2021
Maximum [Member]          
Percentage of Shipbuilding Cost Per Vessel Available to Be Financed by Related Party         10.00%
Subsequent Event [Member] | Major International Financier [Member] | Commitment Letter for a Senior Secured Loan Facility [Member]          
Debt Instrument, Face Amount     $ 107,709    
Debt Instrument, Face Amount, Amount Allocated to Each Vessel     53,854    
Debt Instrument, Periodic Payment, Total     $ 673    
Debt Instrument, Commencement of Payment, Number of Months After Delivery of Each Vessel (Month)     3 months    
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid     $ 32,313    
Subsequent Event [Member] | Major International Financier [Member] | Commitment Letter for a Senior Secured Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate     2.60%    
Subsequent Event [Member] | Major International Financier [Member] | Letter of Credit [Member]          
Debt Instrument, Number of Consecutive Quarterly Installments     32    
Subsequent Event [Member] | M/T Nord Valiant [Member]          
Proceeds from Sale of Property, Plant, and Equipment, Total   $ 26,350   $ 26,350  
Subsequent Event [Member] | Family Trading [Member] | Series E Preferred Stock [Member]          
Stock Issued During Period, Shares, Acquisitions (in shares) | shares 2,188        
Stock Issued During Period, Value, Acquisitions $ 2,188        
Subsequent Event [Member] | Maximum [Member]          
Percentage of Shipbuilding Cost Per Vessel Available to Be Financed by Related Party 20.00%        
Acquisition of VLCC Companies [Member] | Subsequent Event [Member]          
Business Combination, Consideration Transferred, Total $ 29,750        
Business Acquisition, Percentage of Voting Interests Acquired 65.00%        
Business Combination, Step Acquisition, Equity Interest in Acquiree, including Subsequent Acquisition, Percentage, Total 100.00%