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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
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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