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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% |  |  |  |

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