v3.26.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 31, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Information [Line Items]      
Entity Registrant Name NEXT TECHNOLOGY HOLDING INC    
Entity Central Index Key 0001784970    
Entity File Number 001-41450    
Entity Tax Identification Number 84-4948289    
Entity Incorporation, State or Country Code WY    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Public Float     $ 1,003,409,810.5
Entity Incorporation, Date of Incorporation Mar. 28, 2019    
Entity Contact Personnel [Line Items]      
Entity Address, Address Line One 1376-7 OBA    
Entity Address, Address Line Two SAITAMA PREFECTUREGRANDAGE 3    
Entity Address, Address Line Three TAKEBASHI 408    
Entity Address, City or Town KASUKABE CITY    
Entity Address, Country JP    
Entity Address, Postal Zip Code 344-0021    
Entity Phone Fax Numbers [Line Items]      
City Area Code +81    
Local Phone Number 7094081304    
Entity Listings [Line Items]      
Title of 12(b) Security Common Stock, no par value    
Trading Symbol NXTT    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   76,264,374