v3.25.1
Cover - shares
3 Months Ended
Mar. 31, 2025
May 12, 2025
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2025  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-31  
Entity File Number 001-42138  
Entity Registrant Name Flag Ship Acquisition Corporation  
Entity Central Index Key 0001850059  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 26 Broadway  
Entity Address, Address Line Two Suite 934  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10004  
City Area Code (646)  
Local Phone Number 362-0256  
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  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company true  
Entity Common Stock, Shares Outstanding   8,863,000
Units, each consisting of one Ordinary Share, $0.001 par value, and one right    
Title of 12(b) Security Units, each consisting of one Ordinary Share, $0.001 par value, and one right  
Trading Symbol FSHPU  
Security Exchange Name NASDAQ  
Ordinary Share, $0.001 par value    
Title of 12(b) Security Ordinary Share, $0.001 par value  
Trading Symbol FSHP  
Security Exchange Name NASDAQ  
Rights to receive one-tenth (1/10    
Title of 12(b) Security Rights to receive one-tenth (1/10th) of one Ordinary Share  
Trading Symbol FSHPR  
Security Exchange Name NASDAQ