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Commitments and Contitngencies - Long-Term Time Charters (Table) (Details) $ in Thousands	Jun. 30, 2015 USD ($)
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

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- 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

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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

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Namespace Prefix:	cmre_
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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

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Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
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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

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Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
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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

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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

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- References

No definition available.

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