v3.26.1
Cover - shares
 3 Months Ended
Mar. 31, 2026
May 15, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
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 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 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