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Note 5 - Transactions With Related Parties (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 04, 2020 | Mar. 29, 2019 | Jan. 02, 2018 | Sep. 01, 2017 | Apr. 30, 2019 | Jun. 18, 2014 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Due to Related Parties, Current, Total |  |  |  |  |  |  | $ 5,159,000 | $ 16,592,000 |
Central Mare [Member] |  |  |  |  |  |  |  |  |
Due from Related Parties, Current, Total |  |  |  |  |  |  | $ 29,000 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) |  |  |  |  |  |  | 0 |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | $ 326,000 | 326,000 | $ 2,366,000
Central Mare [Member] | Amortization of Awarded Shares [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | $ 34,000 | 34,000 | 34,000
Mr. Evangelos J. Pistiolis [Member] | Incentive Compensation for Completion of Newbuilding Program [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | $ 2,250,000 |  |  |  |  |  |
Central Shipping Monaco SAM [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  | 8,901,000
Management Fees Per Vessel Per Day |  |  |  |  |  | $ 541 |  |  |
Related Party Chartering Commission Percentage |  |  |  |  |  | 1.25% |  |  |
Related Party Sale or Purchase Commission Percentage |  |  |  |  |  | 1.00% |  |  |
Relate Party Financing Commission Percentage |  |  |  |  |  | 0.20% |  |  |
Related Party, Supervision Services Fee, Percentage |  |  |  |  |  | 7.00% |  |  |
Related Party Transaction Term (Year) | 5 years |  |  |  |  |  | 5 years |  |
Due to Related Parties, Current, Total |  |  |  |  |  |  | $ 0 | 0 |
Charter Rate Per Day | $ 16,200 |  |  |  |  |  |  |  |
Central Shipping Monaco SAM [Member] | Technical Management Fee [Member] |  |  |  |  |  |  |  |  |
Management Fees Per Vessel Per Day |  |  |  |  |  | $ 595 |  |  |
Central Shipping Monaco SAM [Member] | Commercial Management Fee [Member] |  |  |  |  |  |  |  |  |
Management Fees Per Vessel Per Day |  |  |  |  |  | $ 328 |  |  |
Central Shipping Monaco SAM [Member] | Newbuilding Supervision Fee [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  | $ 958,000
Central Shipping Monaco SAM [Member] | Optional Year 1 [Member] |  |  |  |  |  |  |  |  |
Charter Rate Per Day | 17,200 |  |  |  |  |  |  |  |
Central Shipping Monaco SAM [Member] | Optional Year 2 [Member] |  |  |  |  |  |  |  |  |
Charter Rate Per Day | $ 18,200 |  |  |  |  |  |  |  |
Central Shipping Inc [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | 12,253,000 | 4,152,000 |
Management Fees Per Vessel Per Day |  |  |  |  |  |  | $ 510 |  |
Related Party Chartering Commission Percentage |  |  |  |  |  |  | 1.25% |  |
Related Party Sale or Purchase Commission Percentage |  |  |  |  |  |  | 1.00% |  |
Relate Party Financing Commission Percentage |  |  |  |  |  |  | 0.20% |  |
Related Party, Supervision Services Fee, Percentage |  |  |  |  |  |  | 7.00% |  |
Related Party Transaction Term (Year) |  |  |  |  |  |  | 5 years |  |
Due to Related Parties, Total |  |  |  |  |  |  | $ 3,116,000 | 621,000 |
Central Shipping Inc [Member] | Technical Management Fee [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | 967,000 | 985,000 |
Management Fees Per Vessel Per Day |  |  |  |  |  |  | 561 |  |
Immediate Family Member of Management or Principal Owner [Member] | Family Trading [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 27,129 |  |  |  |  |  |  |
Family Trading [Member] | Due to Related Parties [Member] |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  | 864,000 | 1,621,000 |
Affiliated Entity [Member] | M/T Stenaweco Elegance [Member] |  |  |  |  |  |  |  |  |
Due to Related Parties, Total |  |  |  |  |  |  | $ 1,150,000 | $ 14,350,000 |
Central Ship Chartering [Member] |  |  |  |  |  |  |  |  |
Related Party Chartering Commission Percentage |  |  |  | 1.25% |  |  |  |  |
Charter Term (Year) |  |  |  | 3 years |  |  |  |  |
Charter Rate Per Day |  |  |  | $ 14,750 |  |  |  |  |
Charter Option Term (Year) |  |  |  | 2 years |  |  |  |  |
Central Ship Chartering [Member] | Optional Year 1 [Member] |  |  |  |  |  |  |  |  |
Charter Rate Per Day |  |  |  | $ 15,250 |  |  |  |  |
Central Ship Chartering [Member] | Optional Year 2 [Member] |  |  |  |  |  |  |  |  |
Charter Rate Per Day |  |  |  | $ 15,750 |  |  |  |  |
Shell Tankers Singapore Private Limited [Member] |  |  |  |  |  |  |  |  |
Percentage of Profit Share Per Day Over Fixed Amount |  |  |  |  | 50.00% |  |  |  |
Shell Tankers Singapore Private Limited [Member] | Optional Year 1 [Member] |  |  |  |  |  |  |  |  |
Charter Rate Per Day |  |  |  |  | $ 13,300 |  |  |  |
Shell Tankers Singapore Private Limited [Member] | Optional Year 2 [Member] |  |  |  |  |  |  |  |  |
Charter Rate Per Day |  |  |  |  | $ 13,950 |  |  |  |

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