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Note 6 - Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to BeyondSpring Inc.—basic and diluted |  | $ | (7,970 | ) |  | $ | (12,010 | ) |  | $ | (91,763 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of ordinary shares outstanding basic and diluted |  |  | 15,171,370 |  |  |  | 16,086,419 |  |  |  | 20,866,084 |
Net loss per share—basic and diluted |  | $ | (0.53 | ) |  | $ | (0.75 | ) |  | $ | (4.40 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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