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Vessels, textual (Details) $ in Thousands		6 Months Ended
	Mar. 16, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) item
Property, Plant and Equipment [Line Items]
Proceeds from Sale of Property, Plant, and Equipment		$ 23,158	$ 8,238
Loss from sale of vessels		203	$ 1,078
Vessel's net book value		9,010		$ 23,361
Acquisitions, improvements and other vessel costs		684
Coronis, Sideris, Oceanis Vessels [Member]
Property, Plant and Equipment [Line Items]
Number Of Vessels To Be Disposed | item				3
Coronis [Member]
Property, Plant and Equipment [Line Items]
Proceeds from Sale of Property, Plant, and Equipment		7,100
Sideris G.S. [Member]
Property, Plant and Equipment [Line Items]
Proceeds from Sale of Property, Plant, and Equipment		11,500
Oceanis [Member]
Property, Plant and Equipment [Line Items]
Proceeds from Sale of Property, Plant, and Equipment		5,750
Naias [Member]
Property, Plant and Equipment [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	$ 11,250
Vessel's net book value	$ 9,010
Equipment And Services [Member]
Property, Plant and Equipment [Line Items]
Acquisitions, improvements and other vessel costs		$ 1,125
Expenditures for equipment and services, paid and capitalized				$ 441

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- Definition

Expenditures for equipment and services, paid and capitalized.

+ References

No definition available.

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- Definition

The number of vessels to be disposed.

+ References

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- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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