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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