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Note 1 - Basis of Presentation (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 13 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2022 USD ($) | Jan. 25, 2021 USD ($) | May 31, 2025 USD ($) | Apr. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Jul. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Aug. 31, 2023 USD ($) | May 31, 2023 USD ($) | Jan. 31, 2023 USD ($) | Aug. 31, 2022 USD ($) | Jul. 31, 2022 USD ($) | May 31, 2022 USD ($) | Jan. 31, 2022 USD ($) | Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | May 31, 2021 USD ($) | Feb. 28, 2021 USD ($) | Jan. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2025 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 31, 2023 USD ($) | Aug. 31, 2025 | Dec. 31, 2024 | Apr. 30, 2023 | Apr. 30, 2022 USD ($)
Companies Accounted For Under Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  | 3 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Axt Tongmei Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Contributions from Parent |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ChaoYang XinMei [Member] | Minority Investor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chao Yang ShuoMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Contributed Capital |  |  |  |  |  |  |  |  |  |  |  |  | $ 334,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chao Yang ShouMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Noncontrolling Interests |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |
Proceeds from Contributions from Parent |  |  |  |  |  |  |  |  |  | $ 600,000 | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |
Loan From Related Party [Member] | ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Jai Mei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  | 7.14% |  |  |  |  | 7.14% |  |  |
ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  |  |  |  |  |  |  |  |  |  |  |  | 58.50% |  |  |  |  |  | 58.50% | 58.50% |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 610,000 | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonredeemable Noncontrolling Interests, Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chao Yang ShouMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00%
Chao Yang ShuoMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 400,000 | $ 200,000 | 406,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonredeemable Noncontrolling Interests, Increase (Decrease) |  |  |  |  |  |  |  |  |  | 44,000 | 75,000 | 36,000 | 73,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beijing Bouy Vessel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  | 33.00% |  |  |  |  |
Beijing Tongmei Xtal Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  | 7.28% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.50% |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Equity Issued on Conversion of Non Controlling Interests |  | 7.28% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.50% |  |  | 7.59% |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Noncontrolling Interests Due to Transfer of Subsidiary with Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Redeemable Noncontrolling Interests Due to Transfer of Subsidiary with Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Beijing Tongmei Xtal Technology [Member] | Nanjing Jin Mei Gallium [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Equity Issued on Conversion of Non Controlling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.38% |  |  |  |  |
Nanjing Jin Mei Gallium [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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% |  |  |  |  |
Jia Mei Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  | 25.00% |
Proceeds from Sale of Equity Method Investments |  |  |  |  |  |  |  |  |  |  | $ 827,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 58.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Investment of Joint Venture Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Joint Venture Formation, Projected Investment Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |
Joint Venture Agreement, Initial Investment Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Interest in Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  | 900,000 | $ 900,000 |  |  |  |  | $ 1,400,000 |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |  | $ 2,600,000
Payments for Advance to Affiliate | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ChaoYang XinMei [Member] | Minority Investor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000
Payments for Advance to Affiliate | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chao Yang ShouMei [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Investment of Joint Venture Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000
Joint Venture Formation, Projected Investment Payment | 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture Agreement, Initial Investment Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chaoyang Kaimei Quartz Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% | [1] |  |  |  |  |  |  | 40.00%
Total Investment of Joint Venture Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,600,000
Joint Venture Formation, Projected Investment Payment | $ 3,000,000 |  |  |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture Agreement, Initial Investment Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Interest in Joint Venture |  |  | $ 300,000 | $ 300,000 | $ 300,000 | $ 300,000 | $ 300,000 | $ 600,000 |  | $ 600,000 |  | $ 900,000 |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Additional Investment in Joint Venture Agreement |  |  |  |  |  |  |  |  | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | In April 2022, Tongmei signed a joint venture agreement with certain investors to fund a new company, ChaoYang KaiMei.

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