Note 7 - Earnings (Loss) Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Net income (loss) attributable to BeyondSpring Inc. – basic and diluted	$ (1,806)	$ (4,031)	$ 2,671	$ (7,262)
Weighted average number of ordinary shares outstanding – basic and diluted (in shares)	40,316,320	39,280,607	40,316,320	39,154,885
Net earnings (loss) per share – basic and diluted (in dollars per share)	$ (0.04)	$ (0.1)	$ 0.07	$ (0.19)