Note 2 - Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net loss attributable to Lindblad Expeditions Holdings, Inc.	$ (35,298)	$ (39,658)	$ (68,539)	$ (41,593)
Series A redeemable convertible preferred stock dividend	1,318	0	2,622	0
Undistributed loss available to stockholders	$ (36,616)	$ (39,658)	$ (71,161)	$ (41,593)
Total weighted average shares outstanding, basic (in shares)	50,064,152	49,741,635	49,964,693	49,683,381
Diluted (in shares)	50,064,152	49,741,635	49,964,693	49,683,381
Basic (in dollars per share)	$ (0.71)	$ (0.80)	$ (1.38)	$ (0.84)
Diluted (in dollars per share)	$ (0.71)	$ (0.80)	$ (1.38)	$ (0.84)