Segment Information (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Information (Textual)
Assets	$ 448,799		$ 424,348
Cost of tours	35,871	$ 32,603
Depreciation and amortization	5,045	3,763
Lindblad segment [Member]
Segment Information (Textual)
Assets	395,200		53,600
Amortization expense	200	200
Intangibles, net	4,600		4,800
Cost of tours	1,000	1,000
Depreciation and amortization	4,700	3,400
Capital expenditures	14,400	22,800
Natural Habitat [Member]
Segment Information (Textual)
Assets	382,700		49,600
Goodwill	22,100		22,100
Intangibles, net	4,600		$ 4,800
Cost of tours	200	200
Capital expenditures	100
Natural Habitat [Member] | Tradenames [Member]
Segment Information (Textual)
Amortization expense	200	200
Natural Habitat [Member] | Customer lists [Member]
Segment Information (Textual)
Amortization expense	200,000	200,000
Depreciation and amortization	$ 400	$ 300