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Note 8 - Costamare Ventures Inc. (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Maximum Investment Amount by Counterparty	$ 250
Minimum Investment Amount by Wholly Owned Subsidiary	75
Option for Maximum Investment Amount by Wholly Owned Subsidiary	$ 240
TermOfAgreement	6 years
Number of Jointly Owned Companies	18
Minimum [Member]
Participation of Company's Wholly Owned Subsidiary	25.00%
Participation After Restatement	25.00%
Maximum [Member]
Participation of Company's Wholly Owned Subsidiary	49.00%
Participation After Restatement	75.00%

X

- Definition

The maximum amount to be invested by the counterparty and to be used in mutually agreed vessel acquisitions, under the terms of the Framework Agreement.

+ References

No definition available.

+ Details

Name:	cmre_MaximumInvestmentAmountByCounterparty
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The minimum amount to be invested by the Company's wholly-owned subsidiary and to be used in mutually agreed vessel acquisitions, under the terms of the Framework Agreement.

+ References

No definition available.

+ Details

Name:	cmre_MinimumInvestmentAmountByWhollyOwnedSubsidiary
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of jointly owned companies formed pursuant to the Framework Agreement with York, that the Company holds a percentage of their capital stock as at the end of the reporting period.

+ References

No definition available.

+ Details

Name:	cmre_NumberOfJointlyOwnedCompanies
Namespace Prefix:	cmre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The optional maximum amount to be invested by the Company's wholly-owned subsidiary and to be used in mutually agreed vessel acquisitions, under the terms of the Framework Agreement.

+ References

No definition available.

+ Details

Name:	cmre_OptionForMaximumInvestmentAmountByWhollyOwnedSubsidiary
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents the percentage of the shareholding of both the Company through Costamare Ventures and York to each affiliated entity.

+ References

No definition available.

+ Details

Name:	cmre_ParticipationAfterRestatement
Namespace Prefix:	cmre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the percentage of the shareholding of the Company through Costamare Ventures, to each entity.

+ References

No definition available.

+ Details

Name:	cmre_ParticipationOfCompanysWhollyOwnedSubsidiary
Namespace Prefix:	cmre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the maximum term of the agreement before its expiration, unless the occurrence of certain extraordinary events.

+ References

No definition available.

+ Details

Name:	cmre_Termofagreement
Namespace Prefix:	cmre_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: