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v3.21.1

Note 20 - Subsequent Events (Details Textual) | Mar. 18, 2021 USD ($) | Mar. 17, 2021 USD ($) | Jan. 06, 2021 USD ($) | Aug. 01, 2016 USD ($)
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ABN Bank [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 64,400,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  | $ 9,050,000
Subsequent Event [Member] | Eco Malibu [Member] | Alpha Bank [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 38,000,000 |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  | $ 21,500,000 |  |
Subsequent Event [Member] | Eco Malibu [Member] | Alpha Bank [Member] | Alpha Facility, First Consecutive Quarterly Installments [Member] |  |  |  |
Number of Consecutive Quarterly Installments |  | 12 |  |
Debt Instrument, Periodic Payment, Principal |  | $ 750,000 |  |
Subsequent Event [Member] | Eco Malibu [Member] | Alpha Bank [Member] | Alpha Facility, Second Consecutive Quarterly Installments [Member] |  |  |  |
Number of Consecutive Quarterly Installments |  | 12 |  |
Debt Instrument, Periodic Payment, Principal |  | $ 625,000 |  |
Subsequent Event [Member] | Eco West Coast [Member] | ABN Bank [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 36,800,000 |  |  |
Number of Consecutive Quarterly Installments | 24 |  |  |
Debt Instrument, Periodic Payment, Principal | $ 615,000 |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid | $ 22,040,000 |  |  |
Debt Instrument, Net Asset Cover Ratio | 125.00% |  |  |
Total Debt To Market Adjusted Total Assets Ratio Percentage | 75.00% |  |  |
Minimum Free Liquidity, Per Collaterlized Vessel | $ 500 |  |  |
Debt Instrument, Covenant, Market Adjusted Total Assets Minus Total Liabilities | $ 60,000,000 |  |  |
Subsequent Event [Member] | Eco West Coast [Member] | ABN Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |
Subsequent Event [Member] | A Company Affiliated With Mr. Evangelos J. Pistiolis [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 23,815,000 |
Subsequent Event [Member] | Three Shipowning Companies [Member] |  |  |  |
Proceeds from Divestiture of Businesses |  |  | 10,000,000 |
Disposal Group, Including Discontinued Operation, Consideration, Payables Forgiven |  |  | $ 1,150,000 |
Disposal Group, Credit Line Option, Percentage of Shipbuilding Costs |  |  | 10.00% |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 23,815,000 |
Subsequent Event [Member] | Three Shipowning Companies [Member] | A Major Oil Company [Member] |  |  |  |
Charter Rate Per Day |  |  | $ 36,000 |
Time Charters, Term, Additional Option (Year) |  |  | 2 years |
Charter Rate Per Day, Optional Year One |  |  | $ 39,000 |
Charter Rate Per Day, Optional Year Two |  |  | $ 41,500 |
Time Charters, Term (Year) |  |  | 3 years |
Subsequent Event [Member] | Three Shipowning Companies [Member] | A Major Oil Company 2 [Member] |  |  |  |
Charter Rate Per Day |  |  | $ 35,750 |
Time Charters, Term, Additional Option (Year) |  |  | 2 years |
Charter Rate Per Day, Optional Year One |  |  | $ 39,000 |
Charter Rate Per Day, Optional Year Two |  |  | $ 41,500 |
Time Charters, Term (Year) |  |  | 3 years |
Subsequent Event [Member] | Three Shipowning Companies [Member] | A Company Affiliated With Mr. Evangelos J. Pistiolis [Member] |  |  |  |
Related Party Transaction Term (Year) |  |  | 5 years |
Charter Rate Per Day |  |  | $ 32,450 |
Time Charters, Term, Additional Option (Year) |  |  | 2 years |
Charter Rate Per Day, Optional Year One |  |  | $ 33,950 |
Charter Rate Per Day, Optional Year Two |  |  | $ 35,450 |
Subsequent Event [Member] | Three Shipowning Companies [Member] | Marshall Islands Company with Suexmax Tanker Contract [Member] |  |  |  |
Ownership Percentage Received |  |  | 100.00% |
Subsequent Event [Member] | Three Shipowning Companies [Member] | Marshall Islands Company with VLCC Tanker Contract for Delivery January 2022 [Member] |  |  |  |
Ownership Percentage Received |  |  | 35.00% |
Subsequent Event [Member] | Three Shipowning Companies [Member] | Marshall Islands Company with VLCC Tanker Contract for Delivery February 2022 [Member] |  |  |  |
Ownership Percentage Received |  |  | 35.00% |

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