Note 12 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Tour revenues	$ 89,654	$ 82,410
Tour revenues, change	$ 7,244
Tour revenues, percentage change	9.00%
Operating income	$ 14,365	14,371
Operating income, change	$ (6)
Operating income, percentage change	0.00%
Depreciation and amortization	$ 6,188	5,045
Total depreciation and amortization, change	$ 1,143
Total depreciation and amortization, percentage change	23.00%
Assets	$ 493,807		$ 473,409
Intangibles, net	7,580		7,975
Goodwill	22,105		22,105
Lindblad Segment [Member]
Tour revenues	76,038	70,453
Tour revenues, change	$ 5,585
Tour revenues, percentage change	8.00%
Operating income	$ 13,641	13,439
Operating income, change	$ 202
Operating income, percentage change	2.00%
Depreciation and amortization	$ 5,794	4,684
Total depreciation and amortization, change	$ 1,110
Total depreciation and amortization, percentage change	24.00%
Assets	$ 425,307		409,622
Intangibles, net	3,869		4,050
Goodwill
Natural Habitat Segment [Member]
Tour revenues	13,616	11,957
Tour revenues, change	$ 1,659
Tour revenues, percentage change	14.00%
Operating income	$ 724	932
Operating income, change	$ (208)
Operating income, percentage change	(22.00%)
Depreciation and amortization	$ 394	$ 361
Total depreciation and amortization, change	$ 33
Total depreciation and amortization, percentage change	9.00%
Assets	$ 68,500		63,787
Intangibles, net	3,711		3,925
Goodwill	$ 22,105		$ 22,105

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