Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Revenue	$ 0	$ 0
Operating expenses
Research and development	(4,388)	(2,644)
General and administrative	(4,557)	(6,110)
Loss from operations	(8,945)	(8,754)
Foreign exchange gain (loss), net	165	(96)
Interest income	78	59
Other income, net	77	22
Loss before income tax	(8,625)	(8,769)
Income tax expenses	(90)	(96)
Net loss from continuing operations	(8,715)	(8,865)
Discontinued operations
Loss from discontinued operations	(12,488)	(7,828)
Gain on disposal of discontinued operations	6,986	0
Income tax expenses	0	0
Net loss from discontinued operations	(5,502)	(7,828)
Net loss	(14,217)	(16,693)
Less: Net loss attributable to noncontrolling interests from continuing operations	(242)	(388)
Less: Net loss attributable to noncontrolling interests from discontinued operations	(12,969)	(5,182)
Net loss attributable to BeyondSpring Inc.	$ (1,006)	$ (11,123)
Continuing operations (in dollars per share)	$ (0.21)	$ (0.21)
Discontinued operations (in dollars per share)		(0.07)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share (in dollars per share)	0.19
Basic and diluted earnings (loss) per share (in dollars per share)	$ (0.02)	$ (0.28)
Weighted-average shares outstanding
Basic and diluted (in shares)	40,406,347	39,733,191
Other comprehensive loss, net of tax of nil:
Comprehensive loss	$ (15,471)	$ (15,966)
Comprehensive loss attributable to BeyondSpring Inc.	(1,740)	(10,681)
Continuing Operations [Member]
Other comprehensive loss, net of tax of nil:
Foreign currency translation adjustment gain (loss) from continuing operations	(1,147)	710
Less: Comprehensive loss attributable to noncontrolling interests from continuing operations	(655)	(131)
Discontinued Operations [Member]
Other comprehensive loss, net of tax of nil:
Foreign currency translation adjustment gain (loss) from continuing operations	(107)	17
Less: Comprehensive loss attributable to noncontrolling interests from continuing operations	$ (13,076)	$ (5,154)