Note 2 - Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net loss attributable to Lindblad Expeditions Holdings, Inc	$ (24,338)	$ (27,379)	$ (92,877)	$ (68,973)
Series A redeemable convertible preferred stock dividend	1,340	425	3,962	425
Undistributed loss available to stockholders	$ (25,678)	$ (27,804)	$ (96,839)	$ (69,398)
Total weighted average shares outstanding, basic (in shares)	50,110,188	49,779,525	50,013,191	49,715,663
Diluted (in shares)	50,110,188	49,779,525	50,013,191	49,715,663
Basic (in dollars per share)	$ (0.50)	$ (0.56)	$ (1.87)	$ (1.40)
Diluted (in dollars per share)	$ (0.50)	$ (0.56)	$ (1.87)	$ (1.40)