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Note 1 - Basis of Presentation and General Information - Excess of Consideration Over Acquired Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Carrying value of net assets of companies sold	$ 24,074
Less: Carrying value of net assets of companies acquired	(3,131)
Less: Consideration received in cash	(10,000)
Less: Settlement of related party payables	(1,150)
Excess of consideration over acquired assets	$ 9,793	$ 62,000

X

- Definition

Amount of assets net of liabilities attributable to disposal group held for sale or disposed of.

+ References

No definition available.

+ Details

Name:	tops_DisposalGroupIncludingDiscontinuedOperationAssetsLiabilitiesNet
Namespace Prefix:	tops_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of payables forgiven as consideration for disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	tops_DisposalGroupIncludingDiscontinuedOperationConsiderationPayablesForgiven
Namespace Prefix:	tops_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This element represents the difference of the historic cost between the acquired vessels net of consideration paid.

+ References

No definition available.

+ Details

Name:	tops_ExcessOfConsiderationOverAcquiredAssets
Namespace Prefix:	tops_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration