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Note 3 - Transactions With Related Parties (Details Textual)		6 Months Ended
	Mar. 03, 2015 USD ($)	Jun. 30, 2017 USD ($) Rate shares	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Management Fees Related Parties		$ 9,387,000	$ 9,570,000
Voyage Expenses Related Parties		1,579,000	1,798,000
Due to Related Parties, Current		218,000		$ 191,000
Due from Related Parties, Current		3,928,000		3,447,000
Costamare Shipping Company SA and Costamare Shipping Services Ltd. [Member]
Annual Fee to Related Parties		$ 2,500,000
Annual Fee to Related Parties, Shares | shares		598,400
Management Fee Per Day, Per Vessel | Rate		95600.00%
Management Fee Per Day, Per Vessel Under Bareboat Charter | Rate		47800.00%
Construction Supervisory Fee		$ 787,400
Commission Charged on Charter Hire Agreements		0.75%
Number of Vessels Under Ship Management Cell		21
Management Fees Related Parties		$ 9,387,000	9,570,000
Voyage Expenses Related Parties		$ 1,579,000	1,798,000
Management Fees Expressed as Gross Revenue		0.75%
Officers Compensation Charged, Period End	$ 1,000,000
Stock Issued During Period, Shares, New Issues | shares		299,200
Fair Value of Shares Issued to Manager		$ 2,078,000	2,746,000
Working Capital Security		$ 1,725,000
Working Capital Security Per Vessel | Rate		7500000.00%
Total Charges by Manager to Companys Affiliates		$ 2,176,000	1,242,000
Due to Related Parties, Current		202,000		191,000
Annual Increase on Fees Payable, Removed	4.00%
Due from Related Parties, Current		3,928,000		2,841,000
Costamare Shipping Company SA and Costamare Shipping Services Ltd. [Member] | General and Administrative Expense [Member]
Officers Compensation Charged, Period End		1,250,000	$ 1,250,000
Ciel Shipmanagement SA [Member]
Due from Related Parties, Current		$ 0		$ 606,000
SCSC Chairman and CEO [Member]
Percentage Ownership		70.00%
SCSC GM [Member]
Percentage Ownership		30.00%
Shanghai Costamare Ship Management Co Ltd [Member]
Number Vessels Managed		14		15
Due to Related Parties, Current		$ 0		$ 0
Due from Related Parties, Current		$ 0		$ 0

X

- Definition

Annual fee for services provided by Costamare Shipping and/ or Costamare Services as at period end

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Annual fee, in shares, for services provided by Costamare Shipping and/ or Costamare Services as at period end.

+ References

No definition available.

+ Details

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X

- Definition

Represents the annual increase on fees payable that has since been removed.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the commission as a percentage paid to Managers on charter hire agreements.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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X

- Definition

This item represents the commission payable to Managers upfront in lieu of the fixed management fee.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the fair value of shares issued to managers.

+ References

No definition available.

+ Details

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X

- Definition

The amount of management fee per day per vessel.

+ References

No definition available.

+ Details

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X

- Definition

The amount of management fee per day, per vessel under bareboat charter.

+ References

No definition available.

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X

- Definition

The percent of revenues expressed as a portion of gross revenues.

+ References

No definition available.

+ Details

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X

- Definition

Fees paid to related parties for providing the company with technical, crewing, bunkering, accounting, provisions, sale, purchase services, as well as general administrative, certain commercial services, director and officer related insurance services.

+ References

No definition available.

+ Details

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X

- Definition

The number of vessels under the ship mangement cell.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of vessels managed.

+ References

No definition available.

+ Details

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X

- Definition

Portion of expenditures for salaries of officers charged at period end. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the percentage of ownership of a related party.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Aggregate amount charged to the companies established pursuant to the Framework Agreement for services provided in accordance with the respective management agreements.

+ References

No definition available.

+ Details

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X

- Definition

Expenses paid to related parties primarily consisting of commissions and fees, which are paid for by the company, regardless of the charter type.

+ References

No definition available.

+ Details

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X

- Definition

The total amount hold by a third party manager as working capital security in accordance with the management agreement between the reporting entity and the third party manager.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

The per vessel amount hold by a third party manager as working capital security in accordance with the management agreement between the reporting entity and the third party manager.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
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X

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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X

- Definition

Number of new stock issued during the period.

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