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Note 18 - Segment Reporting and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Year ended December 31, 2021 |
|  | Plinabulin pipeline |  |  | TPD platform |  |  | Intersegment eliminations |  |  | Consolidated |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Revenue |  |  | - |  |  |  | 1,351 |  |  |  | - |  |  |  | 1,351 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  | (32,077 | ) |  |  | (4,851 | ) |  |  | 40 |  |  |  | (36,888 | )
General and administrative |  |  | (29,737 | ) |  |  | (1,166 | ) |  |  | 200 |  |  |  | (30,703 | )
Loss from operations |  |  | (61,814 | ) |  |  | (4,666 | ) |  |  | 240 |  |  |  | (66,240 | )
Total other income (expenses), net |  |  | 1,382 |  |  |  | 460 |  |  |  | (240 | ) |  |  | 1,602 |
Loss before income tax |  |  | (60,432 | ) |  |  | (4,206 | ) |  |  | - |  |  |  | (64,638 | )
Income tax expenses |  |  | (3,218 | ) |  |  | (352 | ) |  |  | - |  |  |  | (3,570 | )
Net loss |  |  | (63,650 | ) |  |  | (4,558 | ) |  |  | - |  |  |  | (68,208 | )
Less: Net loss attributable to noncontrolling interests |  |  | (4,029 | ) |  |  | - |  |  |  | - |  |  |  | (4,029 | )
Net loss attributable to BeyondSpring Inc. |  |  | (59,621 | ) |  |  | (4,558 | ) |  |  | - |  |  |  | (64,179 | )
|  | Year ended December 31, 2022 |
|  | Plinabulin pipeline |  |  | TPD platform |  |  | Intersegment eliminations |  |  | Consolidated |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Revenue |  |  | - |  |  |  | 1,351 |  |  |  | - |  |  |  | 1,351 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  | (18,180 | ) |  |  | (7,442 | ) |  |  | 40 |  |  |  | (25,582 | )
General and administrative |  |  | (11,346 | ) |  |  | (1,862 | ) |  |  | 200 |  |  |  | (13,008 | )
Loss from operations |  |  | (29,526 | ) |  |  | (7,953 | ) |  |  | 240 |  |  |  | (37,239 | )
Total other income (expenses), net |  |  | 400 |  |  |  | 962 |  |  |  | (240 | ) |  |  | 1,122 |
Loss before income tax |  |  | (29,126 | ) |  |  | (6,991 | ) |  |  | - |  |  |  | (36,117 | )
Income tax expenses |  |  | (227 | ) |  |  | 64 |  |  |  | - |  |  |  | (163 | )
Net loss |  |  | (29,353 | ) |  |  | (6,927 | ) |  |  | - |  |  |  | (36,280 | )
Less: Net loss attributable to noncontrolling interests |  |  | (3,001 | ) |  |  | - |  |  |  | - |  |  |  | (3,001 | )
Net loss attributable to BeyondSpring Inc. |  |  | (26,352 | ) |  |  | (6,927 | ) |  |  | - |  |  |  | (33,279 | )
|  | Year ended December 31, 2023 |
|  | Plinabulin pipeline |  |  | TPD platform |  |  | Intersegment eliminations |  |  | Consolidated |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Revenue |  |  | - |  |  |  | 1,751 |  |  |  | - |  |  |  | 1,751 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  | (7,312 | ) |  |  | (7,363 | ) |  |  | 40 |  |  |  | (14,635 | )
General and administrative |  |  | (8,009 | ) |  |  | (2,421 | ) |  |  | 200 |  |  |  | (10,230 | )
Loss from operations |  |  | (15,321 | ) |  |  | (8,033 | ) |  |  | 240 |  |  |  | (23,114 | )
Total other income (expenses), net |  |  | 1,398 |  |  |  | 114 |  |  |  | (240 | ) |  |  | 1,272 |
Loss before income tax |  |  | (13,923 | ) |  |  | (7,919 | ) |  |  | - |  |  |  | (21,842 | )
Income tax expenses |  |  | (92 | ) |  |  | (14 | ) |  |  | - |  |  |  | (106 | )
Net loss |  |  | (14,015 | ) |  |  | (7,933 | ) |  |  | - |  |  |  | (21,948 | )
Less: Net loss attributable to noncontrolling interests |  |  | (922 | ) |  |  | - |  |  |  | - |  |  |  | (922 | )
Net loss attributable to BeyondSpring Inc. |  |  | (13,093 | ) |  |  | (7,933 | ) |  |  | - |  |  |  | (21,026 | )
Long-Lived Assets by Geographic Areas [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2023 |
|  | $ |  |  | $ |
Property and equipment, net: |  |  |  |  |  |  |  |
PRC |  |  | 90 |  |  |  | 60 |
U.S. |  |  | 1,778 |  |  |  | 1,568 |
Total |  |  | 1,868 |  |  |  | 1,628 |

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