v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 08, 2026
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-34852  
Entity Registrant Name Rare Element Resources Ltd  
Entity Incorporation, State or Country Code A1  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One P.O. Box 80  
Entity Address, City or Town Firestone  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80520  
City Area Code 720  
Local Phone Number 278-2460  
Title of 12(b) Security None  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   645,368,390
Entity Central Index Key 0001419806  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false