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Note 5 - Transactions With Related Parties - Fees Charged by Related Parties (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Commissions on Charter Hire Agreements [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 761 | $ 829 | $ 511
Commissions on Charter Hire Agreements [Member] | Voyage Expenses [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 761 | 829 | 511
Central Mare [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 326 | 326 | 2,366
Central Mare [Member] | Executive Officers and Other Personnel Expenses [Member] | General and Administrative Expense [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 360 | 360 | 2,400
Central Mare [Member] | Amortization of Awarded Shares [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 34 | 34 | 34
Central Mare [Member] | Amortization of Awarded Shares [Member] | Management Fees Related Party [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction | [1] | (34) | (34) | (34)
Central Shipping Monaco SAM [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 8,901
Central Shipping Monaco SAM [Member] | Management Fees [Member] | Vessels, Net [Member] |  |  |  |
Fees charged |  |  |  | 101
Central Shipping Monaco SAM [Member] | Supervision Fee [Member] | Vessels, Net [Member] |  |  |  |
Fees charged |  |  |  | 63
Central Shipping Monaco SAM [Member] | Supervision Fee [Member] | Management Fees - Related Parties [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 2,455
Central Shipping Monaco SAM [Member] | Superintendent Fees [Member] | Vessels, Net [Member] |  |  |  |
Fees charged |  |  |  | 101
Central Shipping Monaco SAM [Member] | Superintendent Fees [Member] | Vessel Operating Expenses [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 187
Central Shipping Monaco SAM [Member] | Accounting and Reporting Cost [Member] | Management Fees - Related Parties [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 233
Central Shipping Monaco SAM [Member] | Financing Fees [Member] | Long-term Debt [Member] |  |  |  |
Financing fees |  |  |  | 139
Central Shipping Monaco SAM [Member] | Commission for Sale and Purchase of Vessels [Member] | Management Fees - Related Parties [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 3,861
Central Shipping Monaco SAM [Member] | Commissions on Charter Hire Agreements [Member] | Voyage Expenses [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 511
Central Shipping Monaco SAM [Member] | Incentive Fee for the Provision of Services [Member] | Management Fees - Related Parties [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | $ 1,250
Central Shipping Inc [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 12,253 | 4,152 |
Central Shipping Inc [Member] | Management Fees [Member] | Vessels, Net [Member] |  |  |  |
Fees charged |  | 69 | 109 |
Central Shipping Inc [Member] | Management Fees [Member] | Management Fees - Related Parties [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 1,953 | 2,237 |
Central Shipping Inc [Member] | Supervision Fee [Member] | Vessels, Net [Member] |  |  |  |
Fees charged |  | 63 | 55 |
Central Shipping Inc [Member] | Superintendent Fees [Member] | Vessels, Net [Member] |  |  |  |
Fees charged |  | 198 | 172 |
Central Shipping Inc [Member] | Superintendent Fees [Member] | Vessel Operating Expenses [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 60 | 247 |
Central Shipping Inc [Member] | Accounting and Reporting Cost [Member] | Management Fees - Related Parties [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 330 | 240 |
Central Shipping Inc [Member] | Financing Fees [Member] | Long-term Debt [Member] |  |  |  |
Financing fees |  |  | 263 |
Central Shipping Inc [Member] | Commission for Sale and Purchase of Vessels [Member] | Investments [Member] |  |  |  |
Fees charged |  | 454 |  |
Central Shipping Inc [Member] | Commission for Sale and Purchase of Vessels [Member] | Right-of-use Assets from Operating Leases [Member] |  |  |  |
Fees charged |  | 1,017 |  |
Central Shipping Inc [Member] | Commission for Sale and Purchase of Vessels [Member] | Management Fees - Related Parties [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 3,377 |  |
Central Shipping Inc [Member] | Commission for Sale and Purchase of Vessels [Member] | Loss from Vessel Sales [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 3,971 |  |
Central Shipping Inc [Member] | Commissions on Charter Hire Agreements [Member] | Voyage Expenses [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 761 | $ 829 |
[1] | As per the Company's equity incentive plan, or the 2015 plan (currently null and void since due to the recent reverse stock splits of the Company’s stock the shares left to be vested are zero), the Company incurred an amortization gain of $34 relating to the amortization of the original fair value of the equity incentive plan recognized at inception, for each of the years ended December 31, 2018, 2019 and 2020.

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- 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
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
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Namespace Prefix: | tops_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
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- Details
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