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Vessels, Net-Additional Information (Details) $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 21, 2010 USD ($) Teutonic | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Gain on sale of vessel |  |  | $ 2,903 |
MSC Azov (Hull H1068A) [Member] |  |  |  |
Capacity of each Vessels | Teutonic | 9,403 |  |  |
Vessels' cost | $ 95,080 |  |  |
Vessels' Delivered on | January 14, 2014 |  |  |
MSC Ajaccio (Hull H1069A) [Member] |  |  |  |
Capacity of each Vessels | Teutonic | 9,403 |  |  |
Vessels' cost | $ 95,080 |  |  |
Vessels' Delivered on | March 14, 2014 |  |  |
MSC Amalfi (Hull H1070A) [Member] |  |  |  |
Capacity of each Vessels | Teutonic | 9,403 |  |  |
Vessels' cost | $ 95,080 |  |  |
Vessels' Delivered on | April 28, 2014 |  |  |
Neapolis, Areopolis and Lakonia acquisition [Member] |  |  |  |
Cost of acquisition of three secondhand vessels |  |  |  | $ 27,740
Konstantina disposal [Member] |  |  |  |
Vessels' disposal price |  |  | 7,546 |
Gain on sale of vessel |  |  | $ (2,903) |
Vessels, Net, Additional Information [Member] |  |  |  |
Carrying value of fully depreciated vessels |  | $ 2,963 |  |
Number of fully depreciated vessels |  | 1 |  |
Carrying value of vessels provided as collaterals to secure loans |  | $ 1,896,568 |  |
Number of vessels provided as collaterals to secure loans |  | 46 |  |

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

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- Definition The carrying value of fully depreciated vessels as of the reporting period. + References No definition available. + Details
Name: | cmre_CarryingValueOfFullyDepreciatedVessels
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value of vessels provided as collaterals to secure loans as of the reporting period. + References No definition available. + Details
Name: | cmre_CarryingValueOfVesselsProvidedAsCollateralsToSecureLoans
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Custom Element. + References No definition available. + Details
Name: | cmre_CostOfAcquisitionOfThreeSecondhandVessels
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The difference between the sale price or salvage price and the book value of a vessel that was sold during the reporting period. This element refers to the gain (loss). + References No definition available. + Details
Name: | cmre_GainLossOnSaleVessels
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The number of fully depreciated vessels as of the reporting period. + References No definition available. + Details
Name: | cmre_NumberOfFullyDepreciatedVessels
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of vessels provided as collaterals to secure loans as of the reporting period. + References No definition available. + Details
Name: | cmre_NumberOfVesselsProvidedAsCollateralsToSecureLoans
Namespace Prefix: | cmre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The price for the acquisition of a vessel or group of vessels. + References No definition available. + Details
Name: | cmre_PriceVessels
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The sale price for the disposal of a vessel or group of vessels. + References No definition available. + Details
Name: | cmre_VesselsDisposalPrice
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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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: |
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- Details
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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: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cmre_KonstantinaDisposalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cmre_VesselsNetAdditionalInformationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |