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Note 6 - Leases (Details Textual) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 10, 2020
Operating Lease, Weighted Average Remaining Lease Term (Month) | 53 months 6 days |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 25,310 | $ 32,594 |
M/T Eco Beverly Hills and M/T Eco Bel Air [Member] |  |  |
Lessee, Operating Lease, Discount Rate |  |  | 6.72%
Operating Lease, Payments | 6,064 |  |
M/T Eco Bel Air and M/T Eco Beverly Hills [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 8,871 |  |
Number of Time Charters | 2 |  |
M/T Nord Valiant [Member] |  |  |
Number of Time Charters | 1 |  |
M/T Eco Marina Del Ray [Member] |  |  |
Number of Time Charters | 1 |  |
M/T Eco West Coast and M/T Eco Malibu [Member] |  |  |
Number of Time Charters | 2 |  |
M/T Eco Los Angeles and M/T Eco City of Angels [Member] |  |  |
Number of Time Charters | 2 |  |

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