Represents Investment Owned Balance Additional Shares Acquired.

No definition available.

Name:	cmre_InvestmentOwnedBalanceAdditionalSharesAcquired
Namespace Prefix:	cmre_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of fair value of offered shares to be paid in case that no third party accepts to buy them.

+ References

No definition available.

+ Details

Name:	cmre_PercentageToBePaidOnOfferedSharesFairValue
Namespace Prefix:	cmre_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares of investment owned.

+ References

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of equity (deficit) attributable to noncontrolling interest. Excludes temporary equity.

+ References

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+ Details

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

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- Details

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Balance Type:
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- Details

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Note 14 - Redeemable Non-controlling Interest (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2025	Dec. 31, 2024	Nov. 14, 2022
Equity, Attributable to Noncontrolling Interest				$ 71,072	$ 57,545
CMRE Inc. [Member] \| Costamare Bulkers Inc. (“CBI”) [Member]
Subsidiary, Ownership Percentage, Parent			92.50%
Equity, Attributable to Noncontrolling Interest				$ 0
CMRE Inc. [Member] \| Costamare Bulkers Inc. (“CBI”) [Member] \| The Put Notice [Member]
Percentage to be Paid on Offered Shares Fair Value						70.00%
CMRE Inc. [Member] \| Costamare Bulkers Inc. (“CBI”) [Member] \| Termination of the Service Contract Without Cause [Member]
Percentage to be Paid on Offered Shares Fair Value						100.00%
CMRE Inc. [Member] \| Costamare Inc. 1 [Member]
Investment Owned, Balance, Shares (in shares)	210,810,810.67		100,000,000
Subsidiary, Ownership Percentage, Parent	97.50%
Proceeds from Contributions from Parent		$ 100,000	$ 100,000
Subsidiary, Ownership Percentage, Noncontrolling Owner			7.50%
CMRE Inc. [Member] \| Other Investors [Member]
Proceeds from Contributions from Parent		$ 3,750	$ 3,750
Subsidiary, Ownership Percentage, Noncontrolling Owner	5.00%
Investment Owned Balance Additional Shares Acquired (in shares)	10,810,810.67	100,000,000
Other Investors [Member] \| Costamare Inc. 1 [Member]
Investment Owned, Balance, Shares (in shares)		8,108,108	8,108,108