Note 1 - Basis of Presentation (Details Textual)		1 Months Ended																			3 Months Ended	6 Months Ended		12 Months Ended		13 Months Ended
	Jan. 25, 2021 USD ($)	Jul. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Aug. 31, 2023 USD ($)	Jul. 31, 2023 USD ($)	May 31, 2023 USD ($)	Jan. 31, 2023 USD ($)	Aug. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	May 31, 2022 USD ($)	Apr. 30, 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 ($)	Jun. 30, 2025		Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2023 USD ($)	May 31, 2025	Dec. 31, 2024	Apr. 30, 2023
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%																			10.00%
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																													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													$ 2,600,000					$ 1,800,000
Payments for Advance to Affiliate												800,000	1,100,000
ChaoYang XinMei [Member] | Minority Investor [Member]
Investments													1,900,000
Payments for Advance to Affiliate												$ 600,000	700,000
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%									40.00%	[1]
Total Investment of Joint Venture Agreement													$ 7,600,000
Joint Venture Formation, Projected Investment Payment					$ 2,300,000								$ 3,000,000
Joint Venture Agreement, Initial Investment Amount											$ 2,200,000
Payments to Acquire Interest in Joint Venture		$ 300,000	$ 300,000	$ 600,000		$ 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.