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Note 8 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | Sep. 08, 2021 | Aug. 13, 2021 | Jun. 30, 2021 | Jan. 06, 2021
--- | --- | --- | --- | ---
Contractual Obligation, Total |  |  | $ 217,293 |
Contractual Obligation, to be Paid, Remainder of Fiscal Year |  |  | 44,500 |
Contractual Obligation, to be Paid, Year One |  |  | 172,793 |
Subsequent Event [Member] |  |  |  |
Contractual Obligation, Total | $ 217,293 |  |  |
M/T Eco Oceano Ca [Member] |  |  |  |
Contractual Obligation, Total |  |  |  | $ 57,143
Contractual Obligation, to be Paid, Remainder of Fiscal Year |  |  | 6,016 |
Contractual Obligation, to be Paid, Year One |  |  | $ 51,127 |
M/T Eco Oceano Ca [Member] | Subsequent Event [Member] |  |  |  |
Contractual Obligation, Total |  | $ 51,127 |  |
VLCC Transaction [Member] | Subsequent Event [Member] |  |  |  |
Contractual Obligation, Total |  | 217,293 |  |
Contractual Obligation, to be Paid, Remainder of Fiscal Year |  | 44,500 |  |
Contractual Obligation, to be Paid, Year One |  | 172,793 |  |
M/T Julius Caesar [Member] | Subsequent Event [Member] |  |  |  |
Contractual Obligation, Total |  | 80,858 |  |
M/T Legio X Equestris [Member] | Subsequent Event [Member] |  |  |  |
Contractual Obligation, Total |  | $ 85,308 |  |

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in remainder of current fiscal year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Details
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X
- Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
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X
- Details
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X
- Details
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