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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: