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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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