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Document And Entity Information
 12 Months Ended
Dec. 31, 2021
shares
Document Information [Line Items]  
Entity Central Index Key 0001677940
Entity Registrant Name BeyondSpring Inc.
Amendment Flag false
Current Fiscal Year End Date --12-31
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2021
Document Type 20-F
Document Annual Report true
Document Period End Date Dec. 31, 2021
Document Transition Report false
Entity File Number 001-38024
Entity Incorporation, State or Country Code KY
Entity Address, Address Line One 28 Liberty Street, 39th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10005
Title of 12(b) Security Ordinary Shares, par value $0.0001 per share
Trading Symbol BYSI
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 38,927,563
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period true
ICFR Auditor Attestation Flag false
Entity Shell Company false
Document Accounting Standard U.S. GAAP
Auditor Name Ernst & Young Hua Ming LLP
Auditor Location Beijing, People’s Republic of China
Auditor Firm ID 1408
Document Shell Company Report false
Document Registration Statement false
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 28 Liberty Street, 39th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10005
City Area Code 646
Local Phone Number 305-6387
Contact Personnel Name Dr. Lan Huang, Chairperson of the Board and Chief Executive Officer