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Note 1 - Nature of the Business Group Internal Restructuring (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Subsidiaries [Table Text Block]
Name of company
 
Place of
incorporation
 
Date of
incorporation
 
Percentage of
ownership by the
Company
 
Principal activities
                 
BeyondSpring Pharmaceuticals Inc. (“BeyondSpring US”)
 
Delaware,

United States of America (“U.S.”)
 
June 18, 2013
 
100%
 
Clinical trial activities
                 
BeyondSpring Ltd.
 
The British Virgin Islands (“BVI”)
 
December 3, 2014
 
100%
 
Holding company
                 
BeyondSpring (HK) Limited (“BeyondSpring HK”)
 
Hong Kong
 
January 13, 2015
 
100%
 
Holding company
                 
Wanchun Biotechnology Limited (“BVI Biotech”)
 
BVI
 
April 1, 2015
 
100%
 
Holding company
                 
Wanchun Biotechnology (Shenzhen) Ltd. (“Wanchun Shenzhen”)
 
The People’s Republic of China
(“PRC”)
 
April 23, 2015
 
100%
 
Holding company
                 
Dalian Wanchunbulin Pharmaceuticals Ltd. (“Wanchunbulin”)
 
PRC
 
May 6, 2015
 
60%
 
Clinical trial activities
                 
BeyondSpring Pharmaceuticals Australia PTY Ltd. (“BeyondSpring Australia”)
 
Australia
 
March 3, 2016
 
100%
 
Clinical trial activities