v3.10.0.1
Document And Entity Information
6 Months Ended
Jun. 30, 2018
Document Information [Line Items]  
Entity Registrant Name BeyondSpring Inc.
Entity Central Index Key 0001677940
Trading Symbol bysi
Current Fiscal Year End Date --12-31
Entity Current Reporting Status Yes
Document Type 6-K
Document Period End Date Jun. 30, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus Q2
Amendment Flag false