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Commitments and Contitngencies - Long-Term Time Charters (Table) (Details) $ in Thousands | Jun. 30, 2015 USD ($)
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Unbilled Receivables, Not Billable, Fiscal Year Maturity [Abstract] |
2015 | $ 238,280
2016 | 429,002
2017 | 371,984
2018 | 198,759
2019 | 122,306
2020 and thereafter | 310,852
Total | $ 1,671,183

X
- Definition The future minimum contractual charter revenues within six years and after from the balance sheet date, based on vessels' committed, non- cancellable, long term time charter contracts. + References No definition available. + Details
Name: | cmre_FutureMinimumContractualCharterRevenueAfterYearFive
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Definition The future minimum contractual charter revenues within six months from the balance sheet date, based on vessels' committed, non-cancellable, long term time charter contracts. + References No definition available. + Details
Name: | cmre_FutureMinimumContractualCharterRevenueInNextSixMonths
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The future minimum contractual charter revenues within five years but more than four years from the balance sheet date, based on vessels' committed, non- cancellable, long term time charter contracts. + References No definition available. + Details
Name: | cmre_FutureMinimumContractualCharterRevenueYearFive
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The future minimum contractual charter revenues within four years but more than three years from the balance sheet date, based on vessels' committed, non- cancellable, long term time charter contracts. + References No definition available. + Details
Name: | cmre_FutureMinimumContractualCharterRevenueYearFour
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The future minimum contractual charter revenues within three years but more than two years from the balance sheet date, based on vessels' committed, non- cancellable, long term time charter contracts. + References No definition available. + Details
Name: | cmre_FutureMinimumContractualCharterRevenueYearThree
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The future minimum contractual charter revenues within two years but more than one year from the balance sheet date, based on vessels' committed, non- cancellable, long term time charter contracts. + References No definition available. + Details
Name: | cmre_FutureMinimumContractualCharterRevenueYearTwo
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total future minimum contractual charter revenues from the balance sheet date to the end of the remaining terms period, based on vessels' committed, non- cancellable, long term time charter contracts. + References No definition available. + Details
Name: | cmre_TotalFutureMinimumContractualCharterRevenue
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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