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Long-term debt-Credit facility-Additional Information (Details) $ in Thousands | 5 Months Ended | 6 Months Ended | 8 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May. 28, 2013 | Jun. 30, 2015 USD ($) | Aug. 22, 2008 | Sep. 30, 2013 USD ($) | Aug. 30, 2013 | Dec. 17, 2012 | Jul. 22, 2008 USD ($)
Fifth supplemental agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of vessels changed their flag | 5 |  |  |  |  |  |
Credit facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum Borrowing Capacity |  |  |  |  |  |  | $ 1,000,000
Portion of the Facility used to repay existing indebtness |  |  |  |  |  |  | $ 631,340
Line of Credit Facility Frequency of Payments |  |  | quarterly |  |  |  |
Line of Credit number of outstanding periodic payments of principal |  | 12 |  |  |  |  |
Line of Credit Periodic Payment of Principal |  | $ 22,473 |  |  |  |  |
Balloon payment |  | $ 271,262 |  |  |  |  |
Loan facility amalgamation date |  | June 30, 2011 |  |  |  |  |
Third supplemental agreement date |  | September 6,2011 |  |  |  |  |
Number of vessels secured the Facility with First priority Mortgages |  | 18 |  |  |  |  |
Number of ship owning companies as corporate guarantees |  | 18 |  |  |  |  |
Credit facility certain term loans [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Minimum liquidity ratio |  | 3.00% |  |  |  |  |
Maximum ratio of Total Liabilities to Market Value Adjusted Total Assets |  | 0.75:1 |  |  |  |  |
Maximum net funded debt to total net assets ratio |  | 80.00% |  |  |  |  |
Minimum liquidity amount |  | $ 30,000 |  |  |  |  |
Minimum Ratio of EBITDA to net interest expense |  | 2.50:1 |  |  |  |  |
Minimum Market Value Adjusted Net Worth |  | $ 500,000 |  |  |  |  |
MSC Antwerp (ex Sophia Britannia) disposal [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Facility repayments due to sale of vessel |  |  |  | $ 1,500 |  |  |
Sixth supplemental agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of vessels replaced existing vessels with first priority mortgage(s) |  |  |  |  | 2 |  |
Fourth supplemental agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of vessels replaced existing vessels with first priority mortgage(s) |  |  |  |  |  | 2 |

X
- Definition This element represents the balloon payment that is payable together with the last installment. + References No definition available. + Details
Name: | cmre_BalloonPayment
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the amounts paid for the Facility repayment after the disposal of the Company's vessels. + References No definition available. + Details
Name: | cmre_FacilityRepaymentsDueToSaleVessel
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of outstanding periodic payments of principal. + References No definition available. + Details
Name: | cmre_LineCreditNumberOutstandingPeriodicPaymentsPrincipal
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Custom Element. + References No definition available. + Details
Name: | cmre_LoanFacilityAmalgamationDate
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the maximum percentage that the net funded debt to total net assets ratio can be on a charter inclusive valuation basis, as required by the financial covenants. + References No definition available. + Details
Name: | cmre_MaximumNetFundedDebtToTotalNetAssetsRatio
Namespace Prefix: | cmre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the Maximum ratio of Total Liabilities (after deducting all cash and cash equivalents) to Market Value Adjusted Total Assets (after deducting all cash and cash equivalents) and is a requirement subject to no Event of Default having occured and being continued, for the payments of dividends without the lenders' consent. + References No definition available. + Details
Name: | cmre_MaximumRatioTotalLiabilitiesToMarketValueAdjustedTotalAssets
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum cash balance of the guarrantor required by the lender and is calculated over the loan outstanding. + References No definition available. + Details
Name: | cmre_MinimumLiquidityAmount
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum cash balance of the guarrantor required by the lender and is calculated over the loan outstanding. + References No definition available. + Details
Name: | cmre_MinimumLiquidityRatio
Namespace Prefix: | cmre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount by which the market value adjusted total assets exceed the total liabilities. + References No definition available. + Details
Name: | cmre_MinimumMarketValueAdjustedNetWorth
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The item represents financial covenant that requires, the set of a minimum ratio of EBITDA to net interest expense. + References No definition available. + Details
Name: | cmre_MinimumRatioOfEbitdaToNetInterestExpense
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of vessels changed their flag during the period. + References No definition available. + Details
Name: | cmre_NumberOfVesselsChangedTheirFlag
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of the Company's vessels that replaced existing vessels with first priority mortgages in a loan facility. + References No definition available. + Details
Name: | cmre_NumberOfVesselsReplacedExistingVesselsWithFirstPriorityMortgages
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of ship-owning companies as corporate guarantees. + References No definition available. + Details
Name: | cmre_NumberShipOwningCompaniesAsCorporateGuarantees
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of vessels secured the Facility with First priority Mortgages. + References No definition available. + Details
Name: | cmre_NumberVesselsSecuredFacilityWithFirstPriorityMortgages
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Portion of the Facility used to repay existing indebtness. + References No definition available. + Details
Name: | cmre_PortionFacilityUsedToRepayExistingIndebtness
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Custom Element. + References No definition available. + Details
Name: | cmre_ThirdSupplementalAgreementDate
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of the frequency of periodic payments, which may be presented in a variety of ways (for example, monthly, quarterly, annually). + 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_LineOfCreditFacilityFrequencyOfPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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
- Definition Amount of the required periodic payment applied to principal. + 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_LineOfCreditFacilityPeriodicPaymentPrincipal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cmre_FifthSupplementalAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cmre_CreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cmre_CreditFacilityCertainTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cmre_MscAntwerpExSophiaBritanniaDisposalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cmre_SixthSupplementalAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |