The amount of depreciation and amortization changed from previous fiscal year.

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The amount of operating income (loss) changed from previous fiscal year.

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The amount of revenue changed from previous fiscal year.

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The percentage of depreciation and amortization changed from previous fiscal year.

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The percentage of revenue changed from previous fiscal year.

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The percentage of operating income (loss) changed from previous fiscal year.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Note 14 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tour revenues	$ 75,796	$ 100,983	$ 76,658	$ 89,654	$ 70,609	$ 87,242	$ 69,473	$ 82,410	$ 343,091	$ 309,734	$ 266,504
Tour revenues, change										$ 33,357	$ 43,230
Tour revenues, percentage change										11.00%	16.00%
Operating income									33,198	$ 25,338	$ 10,744
Operating income, change										$ 7,860	$ 14,594
Operating income, percentage change										31.00%	136.00%
Depreciation and amortization									25,769	$ 20,768	$ 17,351
Total depreciation and amortization, change										$ 5,001	$ 3,417
Total depreciation and amortization, percentage change										24.00%	20.00%
Assets	548,658				473,409				548,658	$ 473,409
Intangibles, net	6,396				7,975				6,396	7,975
Goodwill	22,105				22,105				22,105	22,105
Lindblad Segment [Member]
Tour revenues									272,410	246,334	$ 216,815
Tour revenues, change										$ 26,076	$ 29,519
Tour revenues, percentage change										11.00%	14.00%
Operating income									26,203	$ 19,798	$ 7,292
Operating income, change										$ 6,405	$ 12,506
Operating income, percentage change										32.00%	172.00%
Depreciation and amortization									24,116	$ 19,277	$ 15,969
Total depreciation and amortization, change										$ 4,839	$ 3,308
Total depreciation and amortization, percentage change										25.00%	21.00%
Assets	471,499				409,622				471,499	$ 409,622
Intangibles, net	3,325				4,050				3,325	4,050
Goodwill
Natural Habitat Segment [Member]
Tour revenues									70,681	63,400	$ 49,689
Tour revenues, change										$ 7,281	$ 13,711
Tour revenues, percentage change										11.00%	28.00%
Operating income									6,995	$ 5,540	$ 3,452
Operating income, change										$ 1,455	$ 2,088
Operating income, percentage change										26.00%	60.00%
Depreciation and amortization									1,653	$ 1,491	$ 1,382
Total depreciation and amortization, change										$ 162	$ 109
Total depreciation and amortization, percentage change										11.00%	8.00%
Assets	77,159				63,787				77,159	$ 63,787
Intangibles, net	3,071				3,925				3,071	3,925
Goodwill	$ 22,105				$ 22,105				$ 22,105	$ 22,105