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Note 1 - Basis of Presentation and General Information - Charterers Individually Accounted for More than 10% of the Company's Voyage and Time Charter Revenues (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Zim Integrated Shipping Services Ltd. [Member]
Concentration Risk, Percentage	23.00%	21.00%	0.00%
Maersk Line A/S [Member]
Concentration Risk, Percentage	23.00%	21.00%	21.00%
Sealand Maersk Asia Pte. Ltd. [Member]
Concentration Risk, Percentage	15.00%	21.00%	0.00%
Asyad Line LLC [Member]
Concentration Risk, Percentage	11.00%	0.00%	0.00%
Charterer CMA [Member]
Concentration Risk, Percentage	10.00%	11.00%	24.00%
Vasi Shipping Pte. Ltd., Singapore [Member]
Concentration Risk, Percentage	0.00%	0.00%	15.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-21

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-20

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

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