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Note 11 - Capital Leased Assets and Capital Lease Obligations - Capital Lease Obligations (Details) $ in Thousands	Jun. 30, 2017 USD ($)
Capital lease obligation – current	$ 33,210
Less: current portion of financing costs	(859)
Capital lease obligation – non-current	359,749
Less: non-current portion of financing costs	(3,516)
Total	$ 388,584

X

- Definition

Amount, after accumulated amortization, of capital lease finance costs classified as current.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after accumulated amortization, of capital lease issuance costs classified as non-current.

+ References

No definition available.

+ Details

Name:	cmre_CapitalLeaseObligationsDeferredFinanceCostsNoncurrentNet
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of the gross capital lease obligation due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of the gross capital lease obligation due after one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

Reference 2: 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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