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Note 3 - Going Concern (Details Textual) - USD ($) $ in Thousands | 4 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 23, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 06, 2021
Working Capital Surplus (Deficit) |  | $ 19,672 |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  | 19,328 | $ 4,412 | $ 57 |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  | (22,818) | (14,773) | (11,129) |
Net Cash Provided by (Used in) Operating Activities, Total |  | 6,040 | $ 19,194 | $ 716 |
Contractual Obligation, Total |  | $ 182,016 |  |  |
Subsequent Event [Member] |  |  |  |  |
Contractual Obligation, Total |  |  |  |  | $ 211,171
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  | 38,000
Payments of Contractual Obligation | $ 56,437 |  |  |  |
Subsequent Event [Member] | A Company Affiliated With Mr. Evangelos J. Pistiolis [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 23,815
Subsequent Event [Member] | M/T Julius Caesar [Member] |  |  |  |  |
Interest in Vessel, Percentage |  |  |  |  | 35.00%
Subsequent Event [Member] | M/T Legio X Equestris [Member] |  |  |  |  |
Interest in Vessel, Percentage |  |  |  |  | 35.00%

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