v3.25.2
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 06, 2025
Document Information [Line Items]    
Entity Central Index Key 0001947210  
Entity Registrant Name High Roller Technologies, Inc.  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2025  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-42202  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 87-4159815  
Entity Address, Address Line One 400 South 4th Street, Suite 500-#390  
Entity Address, City or Town Las Vegas  
Entity Address, State or Province NV  
Entity Address, Postal Zip Code 89101  
City Area Code 702  
Local Phone Number 509-5244  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol ROLR  
Security Exchange Name NYSE  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   8,482,174