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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

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=tops_CentralMareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tops_ExecutiveOfficersAndOtherPersonnelExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tops_AmortizationOfAwardedSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=tops_ManagementFeesRelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=tops_CentralShippingMonacoSAMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tops_ManagementFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=tops_VesselsNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tops_SupervisionFeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=tops_ManagementFeesRelatedPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tops_AccountingAndReportingCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tops_CommissionForSaleAndPurchaseOfVesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tops_FinancingFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: