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Represents the number of vessels acquired.

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Represents the maximum amount required to escrow in account to be able to operate guest tour expedition vessels from U.S. ports.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of deposits held by branches of foreign institutions.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2021	Dec. 31, 2025	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Contract with Customer, Liability, Current			$ 318,666	$ 252,199
Advertising Expense			39,400	33,200	$ 31,600
Foreign Financial Institutions, Actual Deposits			$ 7,400	5,800
Required Escrow Deposit Amount, Maximum						$ 32,000
Number of Vessels Owned			10
License Agreement, Term of Contract (Year)	20 years
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			$ 0	0
Office Space, Lease [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)			10 years
Equipment Lease [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)			6 years
Equipment Lease [Member] \| Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)			3 years
Land for Safari Base Camps [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)			95 years
Land for Safari Base Camps [Member] \| Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)			12 years
Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			15 years
Customer Lists [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			5 years
Subsequent Event [Member]
Number of Vessels Acquired		2
Online Advertising [Member]
Advertising Expense			$ 19,900	17,300	14,700
Sales Channel, Directly to Consumer [Member]
Revenues				$ 68,700	$ 59,000