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Note 14 - Financial Instruments - Valuation of Financial Instruments (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Class B Warrants [Member]
Non-current liability		$ 609
Fair Value, Inputs, Level 1 [Member] | Class B Warrants [Member]
Non-current liability		0
Fair Value, Inputs, Level 2 [Member] | Class B Warrants [Member]
Non-current liability		0
Fair Value, Inputs, Level 3 [Member] | Class B Warrants [Member]
Non-current liability		609
Interest Rate Swap [Member]
Current asset (Interest Rate Swaps)		82
Current liability		113
Non-current liability		985
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Current asset (Interest Rate Swaps)		0
Current liability	$ 0
Non-current liability		0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Current asset (Interest Rate Swaps)		82
Current liability		113
Non-current liability		985
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Current asset (Interest Rate Swaps)		0
Current liability	66
Non-current liability		0
The 2014 Warrants [Member] | Fair Value, Inputs, Level 1 [Member]
Current liability		0
The 2014 Warrants [Member] | Fair Value, Inputs, Level 3 [Member]
Current liability		$ 0
Class B Warrants [Member]
Current liability	66
Class B Warrants [Member] | Fair Value, Inputs, Level 2 [Member]
Current liability	$ 0

X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as current asset.

+ References

No definition available.

+ Details

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

X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability, current.

+ References

No definition available.

+ Details

Name:	tops_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueCurrent
Namespace Prefix:	tops_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability, noncurrent.

+ References

No definition available.

+ Details

Name:	tops_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueNoncurrent
Namespace Prefix:	tops_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: