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Note 13 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Aug. 31, 2016	Jun. 30, 2016
Contractual Obligation On JV Newbuilds	$ 2,137
Number of JV Newbuild Vessels Owned at Fourty-Nine Percent	2
Remaining Contractual Commitments	49.00%
Kemp Maritime Co. and Hyde Maritime Co. [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 88,000		$ 88,000
Ainsley Maritime Co. and Ambrose Maritime Co. [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 86,600	$ 86,600
Ainsley Maritime Co., Ambrose Maritime Co., Kemp Maritime Co. and Hyde Maritime Co. [Member]
Debt Guarantee Percentage	100.00%
Long-term Time Charters (Including Charter Agreements Vessels Under Construction) [Member]
Time Charter Arrangements Remaining Terms Period	7 years 180 days
Future Minimum Contractual Charter Revenues Assumptions [Member]
Revenue Days Per Annum	1 year

X

- Definition

This element represents the contractual obligation of the Company as at the period end, of newbuild vessels acquired pursuant to the Framework Agreement with York.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of debt guaranteed to be covered by the entity.

+ References

No definition available.

+ Details

Name:	cmre_DebtGuaranteePercentage
Namespace Prefix:	cmre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This item represents the number of newbuild vessels for which Costamare Ventures has or will contribute 49% of the construction costs and has a contractual commitment as at the period end.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount of remaining contractual commitments.

+ References

No definition available.

+ Details

Name:	cmre_RemainingContractualCommitments
Namespace Prefix:	cmre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of assumed revenue days used in the calculation of the contracted revenue.

+ References

No definition available.

+ Details

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

X

- Definition

The remaining terms period (in total months) of the contracted time charter agreements, including the contracted time charter agreements of vessels under construction, from the end of the reporting period.

+ References

No definition available.

+ Details

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

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=cmre_KempMaritimeCoAndHydeMaritimeCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=cmre_AinsleyMaritimeCoAndAmbroseMaritimeCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=cmre_AinsleyMaritimeCoAmbroseMaritimeCoKempMaritimeCoAndHydeMaritimeCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=cmre_LongtermTimeChartersIncludingCharterAgreementsVesselsUnderConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=cmre_FutureMinimumContractualCharterRevenuesAssumptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: