v3.26.1
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 30, 2026
Jun. 30, 2025
Document Information [Line Items]      
Entity Central Index Key 0001860657    
Entity Registrant Name Allarity Therapeutics, Inc.    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-41160    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 87-2147982    
Entity Address, Address Line One 123 E. Tarpon Ave.    
Entity Address, City or Town Tarpon Springs    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 34689    
City Area Code 401    
Local Phone Number 426-4664    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol ALLR    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 14,730,848
Entity Common Stock, Shares Outstanding   15,818,980  
Auditor Firm ID 392    
Auditor Name Wolf & Company P.C.    
Auditor Location Boston, Massachusetts