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Note 4(a) - Advances for Vessels Acquisitions / Under Construction - Advances for Vessels Acquisitions Under Construction (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Balance | $ 12,241 | $ 38,744
— Advances paid | 117,203 | 158,905
— Capitalized expenses | 3,509 | 3,812
— Transferred to Vessels, net | (76,959) | (189,220)
— Transferred to Assets held for sale | (24,340) |
Balance | $ 31,654 | $ 12,241

X
- Definition Gross amount of capitalized expenses for long-lived assets under construction. + References No definition available. + Details
Name: | tops_AdvancesForVesselsAcquisitionUnderConstructionCapitalizedExpenses
Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Gross amount of advances to the shipyard of long-lived assets under construction. + References No definition available. + Details
Name: | tops_AdvancesForVesselsAcquisitionsUnderConstructionAdvancesPaid
Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Long-lived assets previously under construction that have been transferred to assets held for sale. + References No definition available. + Details
Name: | tops_AdvancesForVesselsAcquisitionsUnderConstructionTransferredToAssetsHeldForSale
Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Long-lived assets previously under construction that as of the balance sheet date have been constructed and have been placed into service. + References No definition available. + Details
Name: | tops_AdvancesForVesselsAcquisitionsUnderConstructionTransferredToVessels
Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration