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Document And Entity Information	3 Months Ended
	Mar. 31, 2020
Document Information [Line Items]
Entity Registrant Name	BeyondSpring Inc.
Entity Central Index Key	0001677940
Current Fiscal Year End Date	--12-31
Document Type	6-K
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
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