v3.26.1
Cover - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Mar. 19, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Registrant Name Columbus Acquisition Corp/Cayman Islands    
Entity Central Index Key 0002028201    
Entity File Number 001-42485    
Entity Tax Identification Number 00-0000000    
Entity Incorporation, State or Country Code E9    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company true    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Public Float     $ 62,950
Entity Address, Address Line One 14 Prudential Tower    
Entity Address, City or Town Singapore    
Entity Address, Country SG    
Entity Address, Postal Zip Code 049712    
City Area Code (+1)    
Local Phone Number 949 899 1827    
Entity Common Stock, Shares Outstanding   4,494,439  
Units, consisting of one ordinary share, $0.0001 par value, and one Right to acquire one-seventh of one ordinary share      
Document Information [Line Items]      
Title of 12(b) Security Units, consisting of one ordinary share, $0.0001 par value, and one Right to acquire one-seventh of one ordinary share    
Trading Symbol COLAU    
Security Exchange Name NASDAQ    
Ordinary shares, par value $0.0001 per share      
Document Information [Line Items]      
Title of 12(b) Security Ordinary shares, par value $0.0001 per share    
Trading Symbol COLA    
Security Exchange Name NASDAQ    
Rights, each whole right to acquire one-seventh of one ordinary share      
Document Information [Line Items]      
Title of 12(b) Security Rights, each whole right to acquire one-seventh of one ordinary share    
Trading Symbol COLAR    
Security Exchange Name NASDAQ