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Note 5 - Transactions With Related Parties - Fees Charged by Related Parties (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Central Mare [Member] |  |
Related Party Transaction, Amounts of Transaction | $ 163 | $ 163
Central Mare [Member] | Executive Officers and Other Personnel Expenses [Member] | General and Administrative Expense [Member] |  |
Related Party Transaction, Amounts of Transaction | 180 | 180
Central Mare [Member] | Amortization of Awarded Shares [Member] | Management Fees Related Party [Member] |  |
Related Party Transaction, Amounts of Transaction | (17) | (17)
Central Shipping Monaco SAM [Member] |  |
Related Party Transaction, Amounts of Transaction | 3,163 | 6,754
Central Shipping Monaco SAM [Member] | Management Fees [Member] | Vessels, Net [Member] |  |
Fees charged | 99 | 31
Central Shipping Monaco SAM [Member] | Supervision Fee [Member] | Vessels, Net [Member] |  |
Fees charged | 27 | 22
Central Shipping Monaco SAM [Member] | Supervision Fee [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction | 705 | 1,063
Central Shipping Monaco SAM [Member] | Superintendent Fees [Member] | Vessels, Net [Member] |  |
Fees charged | 178 | 73
Central Shipping Monaco SAM [Member] | Superintendent Fees [Member] | Vessel Operating Expenses [Member] |  |
Related Party Transaction, Amounts of Transaction | 13 | 49
Central Shipping Monaco SAM [Member] | Accounting and Reporting Cost [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction | 180 | 150
Central Shipping Monaco SAM [Member] | Commission for Sale and Purchase of Vessels [Member] |  |
Fees charged | 702 | 453
Central Shipping Monaco SAM [Member] | Commission for Sale and Purchase of Vessels [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction | 793 | 3,377
Central Shipping Monaco SAM [Member] | Commission for Sale and Purchase of Vessels [Member] | Gain From Vessel Sales [Member] |  |
Related Party Transaction, Amounts of Transaction | 0 | 1,123
Central Shipping Monaco SAM [Member] | Commissions on Charter Hire Agreements [Member] | Voyage Expenses [Member] |  |
Related Party Transaction, Amounts of Transaction | 316 | 413
Central Shipping Monaco SAM [Member] | Financing Fees [Member] | Long-term Debt [Member] |  |
Financing fees | $ 150 | $ 0

X
- Definition Amount of transactions with related party during the financial reporting period, capitalized as of the end of the period. + References No definition available. + Details
Name: | tops_RelatedPartyTransactionAmountsOfTransactionCapitalized
Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of transactions with related party during the financial reporting period, recorded in liabilities on the balance sheet as of the end of the reporting period. + References No definition available. + Details
Name: | tops_RelatedPartyTransactionAmountsOfTransactionRecordedInLiabilities
Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=tops_SuperintendentFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=tops_VesselOperatingExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=tops_GainFromVesselSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=tops_CommissionsOnCharterHireAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=tops_VoyageExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |