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Note 18 - Revenues - Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 60,222	$ 66,088	$ 41,048
Time Charter Contracts [Member]
Revenues	60,222	61,695	39,442
Time Charter - Related Parties [Member]
Revenues	0	1,311	1,606
Voyage Charter [Member]
Revenues	$ 0	$ 3,082	$ 0

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=tops_VoyageCharterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: