Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenues by Type (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lindblad Segment [Member]
Revenues		$ 423,306	$ 397,410	$ 278,449
Land-experience [Member]
Revenues		221,421	172,133	143,051
Sales Channel, Directly to Consumer [Member]
Revenues			68,700	59,000
Guest Ticket [Member] | Lindblad Segment [Member]
Revenues		373,054	345,871	240,592
Guest Ticket [Member] | Land-experience [Member]
Revenues		210,546	164,100	136,122
Guest Ticket [Member] | Sales Channel, Directly to Consumer [Member] | Lindblad Segment [Member]
Revenues	[1],[2]	254,725	226,151	154,345
Guest Ticket [Member] | Sales Channel, Directly to Consumer [Member] | Land-experience [Member]
Revenues		184,420	143,837	115,309
Guest Ticket [Member] | Sales Channel, Agencies [Member] | Lindblad Segment [Member]
Revenues		92,809	90,185	66,298
Guest Ticket [Member] | Sales Channel, Agencies [Member] | Land-experience [Member]
Revenues		22,385	17,129	17,713
Guest Ticket [Member] | Sales Channel, Affinity [Member] | Lindblad Segment [Member]
Revenues		25,520	29,535	19,949
Guest Ticket [Member] | Sales Channel, Affinity [Member] | Land-experience [Member]
Revenues		3,741	3,134	3,100
Other Tour [Member] | Lindblad Segment [Member]
Revenues		50,252	51,539	37,857
Other Tour [Member] | Land-experience [Member]
Revenues		$ 10,875	$ 8,033	$ 6,929

[1] Under the brand license agreement between the Company and National Geographic, effective January 1, 2024, National Geographic no longer receives commissions on sales bookings through the former National Geographic sales channel as the co-selling arrangement operates as direct sales through the Company’s booking system. For the years ended December 31, 2023 and 2022, the National Geographic sales channel accounted for $68.7 million and $59.0 million, respectively, of the Company’s consolidated guest ticket revenue. In the table above, 2023 and 2022 guest ticket revenues derived through the previous National Geographic sales channel have been classified as direct sales to conform to current period’s presentation.

[2] Under the brand license agreement between the Company and National Geographic, effective January 1, 2024, National Geographic no longer receives commissions on sales bookings through the former National Geographic sales channel as the co-selling arrangement operates as direct sales through the Company’s booking system. In the three and nine months ended September 30, 2023, the National Geographic sales channel accounted for $18.6 million and $53.2 million, respectively, of the Company’s consolidated guest ticket revenue. In the table above, 2023 guest ticket revenues derived through the previous National Geographic sales channel have been classified as direct sales for comparison purposes.