Cover - USD ($) $ in Millions	12 Months Ended
Cover - USD ($) $ in Millions	Dec. 31, 2025	Apr. 06, 2026	Jun. 30, 2025
Document Type	10-K/A
Amendment Flag	true
Amendment Description	On March 27, 2026, FG Nexus Inc. (the “Company”) filed, with the Securities and Exchange Commission (the “SEC”), its Annual Report on Form 10-K for the year ended December 31, 2025 (the “Report” or “Form 10-K”). This Amendment No. 1 on Form 10-K (the “Amendment”) updates Part III to provide certain additional information required therein. Except for the changes to Part III and the filing of related certifications added to the list of Exhibits in Part IV, this Amendment makes no other changes to the Form 10-K. This Amendment does not amend, update, or change the financial statements or any other items or disclosures contained in the Report and does not otherwise reflect events occurring after the original filing date of the Report. Accordingly, this Amendment should be read in conjunction with the Report and with the Company’s filings with the SEC subsequent to the filing of the Report. As used in this Amendment, the terms “FG Nexus,” the “Company,” “we,” or “us” refer to FG Nexus Inc.
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		6,431,819
Documents Incorporated By Reference	None
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Common Stock, par value $0.001 per share
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	FGF
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	FGFPP
Security Exchange Name	NASDAQ

FG Nexus Inc. 10-K/A