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Note 4(a) - Advances for Vessels Acquisitions / Under Construction (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Advances for Vessels Acquisitions Under Construction | $ 31,654 | $ 12,241 | $ 38,744
Capitalized Expenses, Gross | 1,641 | $ 4,854 |
M/T West Coast [Member] |  |  |
Advances for Vessels Acquisitions Under Construction | 18,991 |  |
Capitalized Expenses, Gross | 624 |  |
M/T Malibu [Member] |  |  |
Advances for Vessels Acquisitions Under Construction | 12,663 |  |
Capitalized Expenses, Gross | $ 419 |  |

X
- Definition Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. + References No definition available. + Details
Name: | tops_AdvancesForVesselsAcquisitionsUnderConstruction
Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents gross capitalized expenses. + References No definition available. + Details
Name: | tops_CapitalizedExpensesGross
Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=tops_MTWestCoastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=tops_MTMalibuMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |