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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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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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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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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Note 1 - Business and Basis of Presentation (Details Textual) $ in Thousands				1 Months Ended		3 Months Ended
	Apr. 10, 2020 USD ($)	Mar. 16, 2020 USD ($)	Mar. 01, 2020 USD ($)	May 04, 2020 USD ($)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Feb. 28, 2020	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Number of Expedition Ships Operated						9
Number of Seasonal Charter Vessels Operated						5
Percentage of Segment Bookings						27.00%
Percentage of Advanced Booking for Future Travel, Increased, Compared to Second Half of Previous Year						8.00%
Future Bookings For Travel			$ 15,000
Unrestricted Cash						$ 137,040		$ 101,579	$ 70,103
Restricted Cash, Deposits On Future Travel						22,791		7,679	$ 30,537
Debt, Current, Total						382,195		230,001
Export Credit Agency Backed Amortization, Payment Due Over Next 12 Months						9,000
Subsequent Event [Member]
Return of Paycheck Protection Program under CARES Act					$ 6,600
Proceeds from U.S. Small Business Administration Loan	$ 6,600				$ 6,600
Export Credit Agreement [Member]
Proceeds from Lines of Credit, Total		$ 107,700				107,700
Second Senior Credit Agreement [Member] \| Subsequent Event [Member]
Proceeds from Lines of Credit, Total				$ 30,600
Revolving Credit Facility [Member]
Unrestricted Cash, Drawn Under Credit Facility						45,000
Debt, Current, Total						$ 45,000
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
Maximum [Member]
Percentage of Segment Bookings							25.00%
Estimate Cash Usage, Monthly, Including Ship and Office Expense						$ 15,000