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Disclosure - Note 5 - Property, Plant and Equipment, Net (Details Textual) Sheet http://investors.axt.com/20251231/role/statement-note-5-property-plant-and-equipment-net-details-textual Note 5 - Property, Plant and Equipment, Net (Details Textual) Details http://investors.axt.com/20251231/role/statement-note-5-property-plant-and-equipment-net-tables 56 false false R57.htm 995598 - Disclosure - Note 5 - Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment (Details) Sheet http://investors.axt.com/20251231/role/statement-note-5-property-plant-and-equipment-net-schedule-of-property-plant-and-equipment-details Note 5 - Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment (Details) Details 57 false false R58.htm 995599 - Disclosure - Note 6 - Investments in Privately Held Raw Material Companies (Details Textual) Sheet http://investors.axt.com/20251231/role/statement-note-6-investments-in-privately-held-raw-material-companies-details-textual Note 6 - Investments in Privately Held Raw Material Companies (Details Textual) Details http://investors.axt.com/20251231/role/statement-note-6-investments-in-privately-held-raw-material-companies-tables 58 false false R59.htm 995600 - Disclosure - Note 6 - Investments in Privately-Held Raw Material Companies - Summary of Investments (Details) Sheet http://investors.axt.com/20251231/role/statement-note-6-investments-in-privatelyheld-raw-material-companies-summary-of-investments-details Note 6 - Investments in Privately-Held Raw Material Companies - Summary of Investments (Details) Details 59 false false R60.htm 995601 - Disclosure - Note 6 - Investments in Privately-Held Raw Material Companies - Summary Information for Equity Method Investments (Details) Sheet http://investors.axt.com/20251231/role/statement-note-6-investments-in-privatelyheld-raw-material-companies-summary-information-for-equity-method-investments-details Note 6 - Investments in Privately-Held Raw Material Companies - Summary Information for Equity Method Investments (Details) Details 60 false false R61.htm 995602 - 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Bank Loans and Line of Credit - Maturities of Long-Term Loans (Details) Details 66 false false R67.htm 995608 - Disclosure - Note 9 - Stockholders' Equity and Stock Repurchase Program (Details Textual) Sheet http://investors.axt.com/20251231/role/statement-note-9-stockholders-equity-and-stock-repurchase-program-details-textual Note 9 - Stockholders' Equity and Stock Repurchase Program (Details Textual) Details http://investors.axt.com/20251231/role/statement-note-9-stockholders-equity-and-stock-repurchase-program 67 false false R68.htm 995609 - Disclosure - Note 10 - Employee Benefit Plans and Stock-Based Compensation (Details Textual) Sheet http://investors.axt.com/20251231/role/statement-note-10-employee-benefit-plans-and-stockbased-compensation-details-textual Note 10 - Employee Benefit Plans and Stock-Based Compensation (Details Textual) Details http://investors.axt.com/20251231/role/statement-note-10-employee-benefit-plans-and-stockbased-compensation-tables 68 false false R69.htm 995610 - Disclosure - Note 10 - Employee Benefit Plans and Stock-Based Compensation - Summary of Stock Options (Details) Sheet http://investors.axt.com/20251231/role/statement-note-10-employee-benefit-plans-and-stockbased-compensation-summary-of-stock-options-details Note 10 - Employee Benefit Plans and Stock-Based Compensation - Summary of Stock Options (Details) Details 69 false false R70.htm 995611 - Disclosure - Note 10 - Employee Benefit Plans and Stock-based Compensation - Schedule of Options Outstanding and Exercisable Exercise Range (Details) Sheet http://investors.axt.com/20251231/role/statement-note-10-employee-benefit-plans-and-stockbased-compensation-schedule-of-options-outstanding-and-exercisable-exercise-range-details Note 10 - Employee Benefit Plans and Stock-based Compensation - Schedule of Options Outstanding and Exercisable Exercise Range (Details) Details 70 false false R71.htm 995612 - Disclosure - Note 10 - Employee Benefit Plans and Stock-based Compensation - Summary of Restricted Stock Awards (Details) Sheet http://investors.axt.com/20251231/role/statement-note-10-employee-benefit-plans-and-stockbased-compensation-summary-of-restricted-stock-awards-details Note 10 - Employee Benefit Plans and Stock-based Compensation - Summary of Restricted Stock Awards (Details) Details 71 false false R72.htm 995613 - Disclosure - Note 10 - Employee Benefit Plans and Stock-based Compensation - Summary of Performance Shares Activity (Details) Sheet http://investors.axt.com/20251231/role/statement-note-10-employee-benefit-plans-and-stockbased-compensation-summary-of-performance-shares-activity-details Note 10 - Employee Benefit Plans and Stock-based Compensation - Summary of Performance Shares Activity (Details) Details 72 false false R73.htm 995614 - Disclosure - Note 10 - Employee Benefit Plans and Stock-based Compensation - Schedule of Common Stock Reserved and Available for Future Issuance (Details) Sheet http://investors.axt.com/20251231/role/statement-note-10-employee-benefit-plans-and-stockbased-compensation-schedule-of-common-stock-reserved-and-available-for-future-issuance-details Note 10 - Employee Benefit Plans and Stock-based Compensation - Schedule of Common Stock Reserved and Available for Future Issuance (Details) Details 73 false false R74.htm 995615 - 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