Name:	cmre_FutureMinimumContractualCharterRevenueAfterYearFive
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.

Name:	cmre_FutureMinimumContractualCharterRevenueYearFive
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.

Name:	cmre_FutureMinimumContractualCharterRevenueYearFour
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The future minimum contractual charter revenues within twelve months from the balance sheet date, based on vessels' committed, non- cancellable, long term time charter contracts.

No definition available.

Name:	cmre_FutureMinimumContractualCharterRevenueYearOne
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.

Name:	cmre_FutureMinimumContractualCharterRevenueYearThree
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.

Name:	cmre_FutureMinimumContractualCharterRevenueYearTwo
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.

Name:	cmre_TotalFutureMinimumContractualCharterRevenue
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.