XML 27 R50.htm IDEA: XBRL DOCUMENT v3.2.0.727

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

X

- Definition

Custom Element.

+ References

No definition available.

+ Details

Name:	cmre_CapacityOfEachVessels
Namespace Prefix:	cmre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cmre_MscAzovHullH1068AMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cmre_MscAjaccioHullH1069AMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cmre_MscAmalfiHullH1070AMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cmre_NeapolisAndAreopolisAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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