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Document And Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Apr. 10, 2024
Jun. 30, 2023
Document Information [Line Items]      
Entity Central Index Key 0000719274    
Entity Registrant Name GRESHAM WORLDWIDE, INC.    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Annual Report true    
Document Fiscal Year Focus 2023    
Document Type 10-K    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-14605    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 94-2656341    
Entity Address, Address Line One 7272 E. Indian School Rd    
Entity Address, Address Line Two Suite 540    
Entity Address, City or Town Scottsdale    
Entity Address, State or Province AZ    
Entity Address, Postal Zip Code 85251    
City Area Code 833    
Entity Public Float     $ 450,280
Local Phone Number 457-6667    
Title of 12(b) Security Common Stock, No par value    
Trading Symbol GIGA    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Auditor Name Marcum LLPWe have served as the Company’s auditor since 2021    
Auditor Firm ID 688    
Auditor Location New York, New YorkApril 15, 2024    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Documents Incorporated by Reference [Text Block]

DOCUMENTS INCORPORATED BY REFERENCE

    
Entity Common Stock, Shares Outstanding   7,931,602