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Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

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Note 11 - Commitments and Contingencies (Details Textual) $ in Thousands, kr in Millions		1 Months Ended			3 Months Ended
	Mar. 16, 2020 USD ($)	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Feb. 25, 2019 NOK (kr)
Payments to Acquire Property, Plant, and Equipment, Total					$ 116,732	$ 35,144
Selling and Marketing Expense, Total					$ 12,879	14,002
Mr. Bressler [Member] \| Natural Habitat, Inc [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners					19.90%
Ulstein Verft [Member]
Payments to Acquire Property, Plant, and Equipment, Total				$ 30,500
Ulstein Verft [Member] \| Forecast [Member]
Payments to Acquire Property, Plant, and Equipment, Total		$ 15,500
Ulstein Verft [Member] \| Subsequent Event [Member]
Payments to Acquire Property, Plant, and Equipment, Total			$ 30,600
National Geographic [Member]
Royalty Expense					$ 1,200	1,400
Accounts Payable and Other Accrued Liabilities, Current					1,200		$ 2,200
World Wildlife Fund [Member]
Selling and Marketing Expense, Total					200	200
Foreign Exchange Contract [Member] \| Ulstein Verft [Member]
Vessel, Contract Price						$ 153,500		kr 1,291
Export Credit Agreement [Member]
Proceeds from Lines of Credit, Total	$ 107,700				$ 107,700