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Prepaid lease rentals (Table) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Prepaid lease rentals [Abstract]:
Prepaid lease rentals	$ 45,793	$ 49,817
Less: Amortization of prepaid lease rentals	(2,470)	(4,024)
Prepaid lease rentals	43,323	45,793
Less: Current portion	(4,989)	(4,982)
Non-current portion	$ 38,334	$ 40,811

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- Definition

Custom Element.

+ References

No definition available.

+ Details

Name:	cmre_AmortizationOfPrepaidLeaseRent
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

It is the current portion of the unamortized balance of the difference between the fair value of the asset sold and the carrying amount of the asset, when the fair value of the asset sold is more than its carrying amount. It is also include the amount of net settlement of interest rate swaps qualifying for cash flow hedge that has been reclassified as prepaid lease rentals. The prepaid lease rental is amortizing over the lease term.

+ References

No definition available.

+ Details

Name:	cmre_PrepaidLeaseRentals
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	cmre_PrepaidLeaseRentalsAbstract
Namespace Prefix:	cmre_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount before depreciation/ amortization of the difference between the fair value of the asset sold and the carrying amount of the asset, when the fair value of the asset sold is more than its carrying amount and the amount of net settlement of interest rate swaps qualifying for cash flow hedge that has been reclassified as prepaid lease rentals. The prepaid lease rental is amortizing over the lease term.

+ References

No definition available.

+ Details

Name:	cmre_PrepaidLeaseRentalsGross
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount after depreciation of the difference between the fair value of the asset sold and the carrying amount of the asset, when the fair value of the asset sold is more than its carrying amount and the amount of net settlement of interest rate swaps qualifying for cash flow hedge that has been reclassified as prepaid lease rentals.The prepaid lease rental is amortizing over the lease term.

+ References

No definition available.

+ Details

Name:	cmre_PrepaidLeaseRentalsNet
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

It is the non-current portion of the unamortized balance of the difference between the fair value of the asset sold and the carrying amount of the asset, when the fair value of the asset sold is more than its carrying amount. It is also include the amount of net settlement of interest rate swaps qualifying for cash flow hedge that has been reclassified as prepaid lease rentals. The prepaid lease rental is amortizing over the lease term.

+ References

No definition available.

+ Details

Name:	cmre_PrepaidLeaseRentalsNonCurrent
Namespace Prefix:	cmre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant