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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 percentage rate used to calculate dividend payments on preferred stock.

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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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Note 1 - Business and Basis of Presentation (Details Textual) $ / shares in Units, $ in Thousands					1 Months Ended						3 Months Ended	9 Months Ended
	Oct. 26, 2020 USD ($)	Aug. 31, 2020 USD ($) $ / shares shares	Aug. 07, 2020	Apr. 08, 2019	Aug. 31, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	May 04, 2020 USD ($)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	May 31, 2020 USD ($)	Feb. 28, 2020	Dec. 31, 2019 USD ($) shares	May 04, 2016 USD ($)
Number of Expedition Ships Operated												9
Number of Seasonal Charter Vessels Operated												5
Cash and Cash Equivalents, at Carrying Value, Ending Balance										$ 104,135		$ 129,647	$ 104,135			$ 101,579
Restricted Cash and Investments, Current, Total										7,995		16,523	7,995			7,679
Proceeds from Issuance of Preferred Stock and Preference Stock												85,000	$ 0
Long-term Debt, Gross												$ 412,208				$ 230,001
Series A Redeemable Convertible Preferred Stock [Member]
Temporary Equity, Shares Issued (in shares) \| shares												85,000				0
Private Placement [Member] \| Series A Redeemable Convertible Preferred Stock [Member]
Proceeds from Issuance of Preferred Stock and Preference Stock		$ 85,000			$ 85,000
Temporary Equity, Shares Issued (in shares) \| shares		85,000			85,000
Preferred Stock, Dividend Rate, Percentage		6.00%			6.00%
Convertible Preferred Stock, Conversion Price (in dollars per share) \| $ / shares		$ 9.50			$ 9.50
Convertible Preferred Stock, Issued, Premium, Percentage of 30 Trading Volume Weighted Average Price					23.00%
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
Second Export Credit Agreement [Member]
Proceeds from Lines of Credit, Total								$ 30,600		$ 30,500
Debt Instrument, Payments Deferred						$ 9,000
Debt Instrument, Increase (Decrease) in Stated Rate			1.25%		1.25%
Second Export Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			0.75%	3.00%								3.00%
Revolving Credit Facility [Member]
Unrestricted Cash, Drawn Under Credit Facility											$ 45,000
Long-term Debt, Gross												$ 45,000				$ 0
Subsequent Event [Member]
Percentage of Segment Bookings	74.00%
Percentage of Segment Bookings Increase (Decrease) from Prior Year	(4.00%)
Percentage of Advanced Bookings Increase (Decrease) from Prior Year	(12.00%)
Percentage of Last Nine Months Advanced Bookings Increase (Decrease) from Prior Year	12.00%
Future Bookings For Travel	$ 44,000
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
Minimum [Member] \| Second Export Credit Agreement [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