Note 16 - Loans and Line of Credit - Schedule of Short-Term Debt (Details) - USD ($) $ in Thousands		Jun. 30, 2025	Dec. 31, 2024
Short-Term Debt		$ 51,349	$ 45,963
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due January 2026 [Member] | Bank of China [Member]
Debt Instrument, Face Amount	[1]	$ 689
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.70%
Short-Term Debt	[1]	$ 690	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due January 2026 [Member] | China Merchants Bank [Member]
Debt Instrument, Face Amount	[1]	$ 3,155
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.90%
Short-Term Debt	[1]	$ 3,185	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due January 2026 [Member] | NingBo Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,584
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.90%
Short-Term Debt	[1]	$ 1,590	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due March 2026 [Member] | Bank of China [Member]
Debt Instrument, Face Amount	[1]	$ 579
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.70%
Short-Term Debt	[1]	$ 586	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due March 2026 [Member] | China Merchants Bank [Member]
Debt Instrument, Face Amount	[1]	$ 978
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.90%
Short-Term Debt	[1]	$ 985	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due March 2026 [Member] | Bank of Beijing [Member]
Debt Instrument, Face Amount	[2]	$ 2,204
Debt Instrument, Interest Rate, Stated Percentage	[2]	2.70%
Short-Term Debt	[2]	$ 2,210	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due March 2026 [Member] | Industrial Bank [Member]
Debt Instrument, Face Amount	[3]	$ 1,380
Debt Instrument, Interest Rate, Stated Percentage	[3]	3.80%
Short-Term Debt	[3]	$ 1,390	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due March 2026 [Member] | NingBo Bank [Member]
Debt Instrument, Face Amount	[1]	$ 689
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.90%
Short-Term Debt	[1]	$ 700	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2025 [Member] | Bank of China [Member]
Debt Instrument, Face Amount	[4]	$ 1,410
Debt Instrument, Interest Rate, Stated Percentage	[4]	2.40%
Short-Term Debt	[4]	$ 1,410	1,370
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2025 [Member] | Industrial Bank [Member]
Debt Instrument, Face Amount	[1]	$ 2,820
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.90%
Short-Term Debt	[1]	$ 2,820	2,740
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2025 [Member] | Industrial and Commercial Bank of China [Member]
Debt Instrument, Face Amount	[1]	$ 2,820
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.30%
Short-Term Debt	[1]	$ 2,820	2,740
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2025 [Member] | China Citic Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,420
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.90%
Short-Term Debt	[1]	$ 1,420	1,370
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due November 2025 [Member] | Bank of China [Member]
Debt Instrument, Face Amount	[4]	$ 1,370
Debt Instrument, Interest Rate, Stated Percentage	[4]	2.40%
Short-Term Debt	[4]	$ 1,410	1,370
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due November 2025 [Member] | Industrial Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,440
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.20%
Short-Term Debt	[1]	$ 1,455	1,440
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due November 2025 [Member] | NingBo Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,822
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.90%
Short-Term Debt	[1]	$ 1,840	1,822
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due November 2025 [Member] | Agricultural Bank of China [Member]
Debt Instrument, Face Amount	[1]	$ 1,235
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.60%
Short-Term Debt	[1]	$ 1,256	1,235
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due November 2025 Two [Member] | Bank of China [Member]
Debt Instrument, Face Amount	[4]	$ 685
Debt Instrument, Interest Rate, Stated Percentage	[4]	2.70%
Short-Term Debt	[4]	$ 700	685
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due February 2026 [Member] | Bank of China [Member]
Debt Instrument, Face Amount	[4]	$ 2,480
Debt Instrument, Interest Rate, Stated Percentage	[4]	2.50%
Short-Term Debt	[4]	$ 2,490	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due May 2025 [Member] | Bank of Communications [Member]
Debt Instrument, Face Amount	[1]	$ 1,376
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.00%
Short-Term Debt	[1]	$ 0	1,370
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due May 2025 Two [Member] | Bank of Communications [Member]
Debt Instrument, Face Amount	[1]	$ 2,480
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.00%
Short-Term Debt	[1]	$ 0	2,466
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due December 2025 [Member] | Bank of Communications [Member]
Debt Instrument, Face Amount	[1]	$ 1,420
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.50%
Short-Term Debt	[1]	$ 1,420	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due December 2025 [Member] | NingBo Bank [Member]
Debt Instrument, Face Amount	[1]	$ 550
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.90%
Short-Term Debt	[1]	$ 558	550
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due December 2025 [Member] | Agricultural Bank of China [Member]
Debt Instrument, Face Amount	[1]	$ 137
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.60%
Short-Term Debt	[1]	$ 140	137
Beijing Tongmei Xtal Technology [Member] | Bank Loans Due June 2026 [Member] | Bank of Communications [Member]
Debt Instrument, Face Amount	[1]	$ 2,023
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.60%
Short-Term Debt	[1]	$ 2,023	0
Beijing Tongmei Xtal Technology [Member] | Bank Loans Due June 2026 [Member] | Bank of Beijing [Member]
Debt Instrument, Face Amount	[2]	$ 3,627
Debt Instrument, Interest Rate, Stated Percentage	[2]	2.60%
Short-Term Debt	[2]	$ 3,627	0
Beijing Tongmei Xtal Technology [Member] | Bank Loans Due June 2026 [Member] | NingBo Bank [Member]
Debt Instrument, Face Amount	[1]	$ 579
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.80%
Short-Term Debt	[1]	$ 579	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due January 2025 [Member] | China Merchants Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,386
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.50%
Short-Term Debt	[1]	$ 0	1,370
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due January 2025 [Member] | NingBo Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,647
Debt Instrument, Interest Rate, Stated Percentage	[1]	4.30%
Short-Term Debt	[1]	$ 0	1,630
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due February 2025 [Member] | China Merchants Bank [Member]
Debt Instrument, Face Amount	[1]	$ 692
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.50%
Short-Term Debt	[1]	$ 0	685
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due February 2025 [Member] | Bank of Beijing [Member]
Debt Instrument, Face Amount	[2]	$ 3,600
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.00%
Short-Term Debt	[2]	$ 0	3,565
Beijing Tongmei Xtal Technology [Member] | Bank Loans Due April 2025 [Member] | China Merchants Bank [Member]
Debt Instrument, Face Amount	[1]	$ 692
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.50%
Short-Term Debt	[1]	$ 0	685
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due June 2025 [Member] | Bank of Beijing [Member]
Debt Instrument, Face Amount	[2]	$ 3,580
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.00%
Short-Term Debt	[2]	$ 0	3,565
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due June 2025 [Member] | China Citic Bank [Member]
Debt Instrument, Face Amount	[1]	$ 2,752
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.90%
Short-Term Debt	[1]	$ 0	2,740
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due March 2026 Two [Member] | Bank of Beijing [Member]
Debt Instrument, Face Amount	[2]	$ 1,405
Debt Instrument, Interest Rate, Stated Percentage	[2]	2.60%
Short-Term Debt	[2]	$ 1,405	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due March 2026 Two [Member] | NingBo Bank [Member]
Debt Instrument, Face Amount	[1]	$ 628
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.90%
Short-Term Debt	[1]	$ 628	0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due October 2025 [Member] | Industrial Bank [Member]
Debt Instrument, Face Amount	[1]	$ 2,679
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.90%
Short-Term Debt	[1]	$ 2,700	2,679
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due March 2025 [Member] | NingBo Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,258
Debt Instrument, Interest Rate, Stated Percentage	[1]	4.30%
Short-Term Debt	[1]	$ 0	1,255
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due July 2025 [Member] | China Citic Bank [Member]
Debt Instrument, Face Amount	[1]	$ 2,820
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.90%
Short-Term Debt	[1]	$ 2,820	2,740
Beijing Bouy Vessel [Member] | Bank Loan Due September 2025 [Member] | Industrial and Commercial Bank of China [Member]
Debt Instrument, Face Amount	[1]	$ 1,420
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.80%
Short-Term Debt	[1]	$ 1,420	1,370
Beijing Bouy Vessel [Member] | Bank Loan Due November 2025 [Member] | Industrial Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,370
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.70%
Short-Term Debt	[1]	$ 1,385	1,370
Beijing Bouy Vessel [Member] | Bank Loan Due May 2025 [Member] | Bank of Communications [Member]
Debt Instrument, Face Amount	[1]	$ 274
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.00%
Short-Term Debt	[1]	$ 0	274
Beijing Bouy Vessel [Member] | Bank Loan Due December 2025 [Member] | Bank of China [Member]
Debt Instrument, Face Amount	[1]	$ 274
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.40%
Short-Term Debt	[1]	$ 279	274
Beijing Bouy Vessel [Member] | Bank Loan Due December 2025 [Member] | NonJing Bank [Member]
Debt Instrument, Face Amount	[1]	$ 1,370
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.80%
Short-Term Debt	[1]	$ 1,385	1,370
Beijing Bouy Vessel [Member] | Bank Loans Due June 2026 [Member] | Bank of Communications [Member]
Debt Instrument, Face Amount	[1]	$ 767
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.60%
Short-Term Debt	[1]	$ 767	0
Beijing Bouy Vessel [Member] | Bank Loan Due September 2025 Two [Member] | Bank of China [Member]
Debt Instrument, Face Amount	[1]	$ 1,145
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.30%
Short-Term Debt	[1]	$ 837	1,096
Beijing Bouy Vessel [Member] | Bank Loans Due June 2026 Two [Member] | China Merchants Bank [Member]
Debt Instrument, Face Amount	[1]	$ 419
Debt Instrument, Interest Rate, Stated Percentage	[1]	2.40%
Short-Term Debt	[1]	$ 419	$ 0

[1] Not collateralized.

[2] AXT time deposit.

[3] Chaoyang JinMei’s land use rights and its building located at its facility in Kazuo, China.

[4] Baoding Tongmei’s land use rights and its building located at its facility in Dingxing, China. In addition, the loan attracts a guarantee fee amounting to 1.0% of the loan amount.