v3.25.1
Cover
Jun. 12, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jun. 12, 2025
Entity Registrant Name CASTELLUM, INC.
Entity Incorporation, State or Country Code NV
Entity File Number 001-41526
Entity Tax Identification Number 27-4079982
Entity Address, Address Line One 1934 Old Gallows Road, Suite 350
Entity Address, City or Town Vienna
Entity Address, State or Province VA
Entity Address, Postal Zip Code 22182
City Area Code 703
Local Phone Number 752-6157
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, par value $0.0001 per share
Trading Symbol CTM
Security Exchange Name NYSEAMER
Entity Emerging Growth Company true
Entity Ex Transition Period true
Entity Central Index Key 0001877939
Amendment Flag false