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Note 18 - Segment Reporting and Geographic Information - Operating Information by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue $ 1,751 $ 1,351 $ 1,351
Research and development (14,635) (25,582) (36,888)
General and administrative (10,230) (13,008) (30,703)
Loss from operations (23,114) (37,239) (66,240)
Total other income (expenses), net 1,272 1,122 1,602
Loss before income tax (21,842) (36,117) (64,638)
Income tax expenses (106) (163) (3,570)
Net loss (21,948) (36,280) (68,208)
Less: Net loss attributable to noncontrolling interests (922) (3,001) (4,029)
Net loss attributable to BeyondSpring Inc. (21,026) (33,279) (64,179)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]      
Revenue 0 0 0
Research and development 40 40 40
General and administrative 200 200 200
Loss from operations 240 240 240
Total other income (expenses), net (240) (240) (240)
Loss before income tax 0 0 0
Income tax expenses 0 0 0
Net loss 0 0 0
Less: Net loss attributable to noncontrolling interests 0 0 0
Net loss attributable to BeyondSpring Inc. 0 0 0
Plinabulin Pipeline [Member] | Operating Segments [Member]      
Revenue 0   0
Research and development (7,312)   (32,077)
General and administrative (8,009)   (29,737)
Loss from operations (15,321)   (61,814)
Total other income (expenses), net 1,398   1,382
Loss before income tax (13,923)   (60,432)
Income tax expenses (92)   (3,218)
Net loss (14,015)   (63,650)
Less: Net loss attributable to noncontrolling interests (922)   (4,029)
Net loss attributable to BeyondSpring Inc. (13,093)   (59,621)
Plinabulin Pipeline [Member] | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]      
Revenue   0  
Research and development   (18,180)  
General and administrative   (11,346)  
Loss from operations   (29,526)  
Total other income (expenses), net   400  
Loss before income tax   (29,126)  
Income tax expenses   (227)  
Net loss   (29,353)  
Less: Net loss attributable to noncontrolling interests   (3,001)  
Net loss attributable to BeyondSpring Inc.   (26,352)  
TPD Platform [Member] | Operating Segments [Member]      
Revenue 1,751 1,351 1,351
Research and development (7,363) (7,442) (4,851)
General and administrative (2,421) (1,862) (1,166)
Loss from operations (8,033) (7,953) (4,666)
Total other income (expenses), net 114 962 460
Loss before income tax (7,919) (6,991) (4,206)
Income tax expenses (14) 64 (352)
Net loss (7,933) (6,927) (4,558)
Less: Net loss attributable to noncontrolling interests 0 0 0
Net loss attributable to BeyondSpring Inc. $ (7,933) $ (6,927) $ (4,558)