v3.26.1
Note 6 - Investments in Privately Held Raw Material Companies (Details Textual)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 25, 2021
USD ($)
May 31, 2025
USD ($)
Apr. 30, 2025
USD ($)
Nov. 30, 2024
USD ($)
May 31, 2024
USD ($)
Nov. 30, 2023
USD ($)
May 31, 2023
USD ($)
Apr. 30, 2023
USD ($)
Jan. 31, 2021
USD ($)
Dec. 31, 2020
Dec. 31, 2020
USD ($)
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
Dec. 31, 2020
USD ($)
Apr. 30, 2022
Proceeds from Sale of Equity Method Investments                         $ 0 $ 0 $ 827,000      
Equity Method Investment, Realized Gain (Loss) On Adjustment To Fair Value                         163,000          
Equity Method Investment, Realized Gain (Loss) on Disposal                         (0) (0) (166,000)      
Equity Method Investments                         14,968,000 14,066,000        
Undistributed Earnings, Basic                         8,000,000 9,200,000        
Other Assets [Member]                                    
Equity Method Investments                         $ 15,000,000 14,100,000        
Jia Mei Investment [Member]                                    
Percentage of Equity Method Investment Interest Sold             15.00%                      
Equity Method Investment, Ownership Percentage               25.00%         0.00%          
Proceeds from Sale of Equity Method Investments             $ 827,000                      
Equity Method Investment, Other-than-Temporary Impairment   $ 145,000                                
Equity Method Investment, Realized Gain (Loss) On Adjustment To Fair Value                       $ 296,000            
Equity Method Investment, Realized Gain (Loss) on Disposal                         $ 12,000          
Proceeds from Dividends Received     $ 900,000                              
Chaoyang Kaimei Quartz Co [Member]                                    
Equity Method Investment, Ownership Percentage                         40.00% [1]         40.00%
Equity Method Investments                         $ 4,713,000 3,895,000        
Beijing Jiya [Member]                                    
Equity Method Investment, Ownership Percentage                         39.00%          
Equity Method Investments                         $ 4,428,000 4,867,000        
Proceeds from Dividends Received       $ 300,000   $ 500,000   $ 2,000,000                    
Xiaoyi Xingan Gallium [Member]                                    
Equity Method Investment, Ownership Percentage [2]                         25.00%          
Equity Method Investments                         $ 5,827,000 5,304,000        
Proceeds from Dividends Received         $ 2,100,000     $ 1,800,000                    
PRC Subsidiaries And Raw Material Joint Ventures [Member]                                    
Proceeds from Dividends Received                         900,000 2,400,000 4,300,000      
Five Minority Investments [Member]                                    
Equity Method Investments, Income (Loss), Excluding Impairment Charges                         $ 600,000 $ 3,400,000 $ 1,900,000      
Investor One [Member] | Jia Mei Investment [Member]                                    
Equity Method Investment, Ownership Percentage   8.90%                                
Payments to Acquire Investments   $ 360,000                                
Investor Two [Member] | Jia Mei Investment [Member]                                    
Equity Method Investment, Ownership Percentage   8.90%                                
Payments to Acquire Investments   $ 360,000                                
Beijing Bouy Vessel [Member]                                    
Subsidiary, Ownership Percentage, Noncontrolling Owner                   33.00% 33.00%           33.00%  
Beijing Bouy Vessel [Member] | Beijing Bouy Vessel [Member]                                    
Percentage of Equity Issued on Conversion of Non Controlling Interests                                 7.59%  
Nanjing Jin Mei Gallium [Member]                                    
Subsidiary, Ownership Percentage, Noncontrolling Owner                   8.50% 8.50%           8.50%  
Nanjing Jin Mei Gallium [Member] | Nanjing Jin Mei Gallium [Member]                                    
Percentage of Equity Issued on Conversion of Non Controlling Interests                                 0.38%  
Beijing Tongmei Xtal Technology [Member]                                    
Subsidiary, Ownership Percentage, Noncontrolling Owner 7.28%                       14.50%          
Percentage of Equity Issued on Conversion of Non Controlling Interests 7.28%                 7.59%           14.50%    
Percentage of Equity Purchased by Employees, Key Managers, and Contributors                                 0.40%  
Capital Received From Private Equity Funds                 $ 1,500,000   $ 48,100,000           $ 48,100,000  
Capital Received, Approved $ 49,000,000                                  
Beijing Tongmei Xtal Technology [Member] | Nanjing Jin Mei Gallium [Member]                                    
Percentage of Equity Issued on Conversion of Non Controlling Interests                                 0.38%  
Jai Mei [Member]                                    
Subsidiary, Ownership Percentage, Noncontrolling Owner             10.00%                      
Number of Investors   2                                
Jia Mei Investment [Member]                                    
Subsidiary, Ownership Percentage, Noncontrolling Owner                       7.10% 0.00% [3]          
[1] In April 2022, Tongmei signed a joint venture agreement with certain investors to fund a new company, ChaoYang KaiMei.
[2] In preparation for Tongmei’s application for a listing of shares in an IPO on the STAR Market, in late December 2020 we reorganized our entity structures in China. JinMei and BoYu and their subsidiaries, previously organized under AXT, Inc., were assigned to Tongmei and effectively merged with Tongmei although they retained their own respective legal entity status and are wholly owned subsidiaries of Tongmei. The 33% minority interest stakeholders of BoYu converted their ownership to a 7.59% minority interest in Tongmei. The 8.5% minority interest stakeholders, employees of JinMei, converted their ownership to a 0.38% minority interest in Tongmei. Further, a number of employees, key managers and contributors, purchased a 0.4% minority interest in Tongmei. In 2020, the Investors transferred approximately $48.1 million of new capital to Tongmei. An additional investment of approximately $1.5 million of new capital was funded in early January 2021. Under China regulations these investments must be formally approved by the appropriate government agency and are not deemed to be dilutive until such approval is granted. The government approved the approximately $49 million investment in its entirety on January 25, 2021 at which time the Investors owned a redeemable noncontrolling interest in Tongmei of 7.28%. As of December 31, 2022, Tongmei’s noncontrolling interests and redeemable noncontrolling interests totaled approximately 14.5%. AXT remains the controlling stakeholder of Tongmei and holds a majority of the Board of Director positions of Tongmei.
[3] In May 2023, we sold 15% of our equity investments in Jia Mei to a third party. We now own 10% of the equity ownership of Jia Mei and account for it under the fair value method.