v3.26.1
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Mar. 23, 2026
Jun. 30, 2025
Document Type 10-K      
Amendment Flag false      
Document Annual Report true      
Document Transition Report false      
Document Period End Date Dec. 31, 2025      
Document Fiscal Period Focus FY      
Document Fiscal Year Focus 2025      
Current Fiscal Year End Date --12-31      
Entity File Number 001-36366      
Entity Registrant Name FG Nexus Inc.      
Entity Central Index Key 0001591890      
Entity Tax Identification Number 46-1119100      
Entity Incorporation, State or Country Code NV      
Entity Address, Address Line One 6408 Bannington Road      
Entity Address, City or Town Charlotte      
Entity Address, State or Province NC      
Entity Address, Postal Zip Code 28226      
City Area Code (704)      
Local Phone Number 994-8279      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Interactive Data Current Yes      
Entity Filer Category Non-accelerated Filer      
Entity Small Business true      
Entity Emerging Growth Company false      
Entity Shell Company false      
Entity Public Float       $ 13.2
Entity Common Stock, Shares Outstanding     6,530,207  
Documents Incorporated By Reference Portions of the Company’s Proxy Statement for its 2026 Annual Meeting of Stockholders are incorporated by reference in Part III, Items 10, 11, 12, 13 and 14.      
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Auditor Firm ID 207 200    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheet of FG Nexus Inc. (the “Company”) as of December 31, 2025, and the related consolidated statements of operations, comprehensive loss, stockholders’ equity, and cash flows for the year ended December 31, 2025, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the 2025 consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025, and the results of its operations and its cash flows for the year ended December 31, 2025 in conformity with accounting principles generally accepted in the United States of America.We also have audited the adjustments to retrospectively apply the one-for-five reverse stock split effected on February 13, 2026, and to retrospectively reflect the discontinued operations to the 2024 consolidated financial statements as described in Note 1 and Note 7, respectively. In our opinion, such adjustments and related disclosures are appropriate and have been properly applied. We were not engaged to audit, review, or apply any procedures to the 2024 consolidated financial statements of the Company other than with respect to such adjustments and, accordingly, we do not express an opinion or any other form of assurance on the 2024 consolidated financial statements taken as a whole.      
Auditor Name BPM LLP HASKELL & WHITE LLP    
Auditor Location Santa Rosa, California Irvine, California    
Common Stock, par value $0.001 per share        
Title of 12(b) Security Common Stock, par value $0.001 per share      
Trading Symbol FGNX      
Security Exchange Name NASDAQ      
8.00% Cumulative Preferred Stock, Series A, par value $25.00 per share        
Title of 12(b) Security 8.00% Cumulative Preferred Stock, Series A, par value $25.00 per share      
Trading Symbol FGNXP      
Security Exchange Name NASDAQ