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The amount of increase (decrease) in stated rate of a debt instrument.

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Represents percentage of advanced booking for future travel more bookings compared to send half of previous year.

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The percentage of projected revenues for the year that have achieved during period.

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Represents percentage of segment bookings.

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The cash inflow received from loan funding under the Paycheck Protection Program which was established under the Coronavirus Aid, Relief and Economic Security (CARES) Act in March 2020.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Note 1 - Business and Basis of Presentation (Details Textual) $ in Thousands				1 Months Ended				3 Months Ended	6 Months Ended
	Aug. 07, 2020	Apr. 10, 2020 USD ($)	Apr. 08, 2019	Jun. 30, 2020 USD ($)	May 04, 2020 USD ($)	Apr. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	May 31, 2020 USD ($)	Feb. 28, 2020	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	May 04, 2016 USD ($)
Number of Expedition Ships Operated				9					9
Number of Seasonal Charter Vessels Operated				5					5
Percentage of Segment Bookings				62.00%					62.00%
Percentage of Advanced Booking for Future Travel, Increased, Compared to Second Half of Previous Year				6.00%					6.00%				35.00%
Future Bookings For Travel				$ 30,000					$ 30,000
Cash and Cash Equivalents, at Carrying Value, Ending Balance				80,897					80,897			$ 101,579	$ 78,746
Restricted Cash and Investments, Current, Total				21,333					21,333			7,679	$ 33,305
Long-term Debt, Gross				412,340					412,340			230,001
Return of Paycheck Protection Program under CARES Act		$ 6,600				$ 6,600
Proceeds from Paycheck Protection Program Under CARES Act		$ 6,600				6,600
Export Credit Agreement [Member]
Proceeds from Lines of Credit, Total								$ 107,700	107,700
Export Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate								3.00%
Second Senior Credit Agreement [Member]
Proceeds from Lines of Credit, Total					$ 30,600
Promissory Notes, Natural Habitat Acquisition [Member]
Debt Instrument, Face Amount				2,500					$ 2,500	$ 2,500				$ 2,500
Second Export Credit Agreement [Member]
Proceeds from Lines of Credit, Total						$ 30,600	$ 30,500
Debt Instrument, Payments Deferred				9,000
Second Export Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			3.00%						3.00%
Second Export Credit Agreement [Member] \| Subsequent Event [Member]
Debt Instrument, Increase (Decrease) in Stated Rate	1.25%
Revolving Credit Facility [Member]
Unrestricted Cash, Drawn Under Credit Facility									$ 45,000
Long-term Debt, Gross				$ 45,000					$ 45,000			$ 0
Guest Ticket [Member]
Percentage of Projected Revenues									86.00%
Minimum [Member]
Capital Expenditures, Expected Annual Maintenance Amount, Decrease During period									$ 10,000
Estimate Cash Usage, Monthly, Including Ship and Office Expense									10,000
Minimum [Member] \| Second Export Credit Agreement [Member] \| Subsequent Event [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Maximum [Member]
Percentage of Segment Bookings											25.00%
Estimate Cash Usage, Monthly, Including Ship and Office Expense									$ 15,000