Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments (Details Textual) $ in Thousands	12 Months Ended	36 Months Ended
Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2025 USD ($)
Number of Vessel Sold or Recycled			8
Number of Vessels, Held for Sale	0	0		0
Number of Vessels Sold	12	6	7
Proceeds from Sale of Vessels and Other Assets	$ 17,600	$ 19,300	$ 15,500
Vessel, Obsolete Inventory [Member]
Asset Impairment Charges				$ 0
Vessels Held for Sale [Member]
Asset, Held-for-Sale, Not Part of Disposal Group			$ 4,200

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 942
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-Name Accounting Standards Codification
-Section S50
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 942
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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