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Note 16 - Loans and Line of Credit - Schedule of Short-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Short-Term Debt $ 57,003 $ 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] $ 705 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] $ 3,220 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] $ 1,620 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] $ 705 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due July 2026 [Member] | Bank of China [Member]    
Debt Instrument, Face Amount [1] $ 112  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.60%  
Short-Term Debt [1] $ 112 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due July 2026 [Member] | NingBo Bank [Member]    
Debt Instrument, Face Amount [1] $ 632  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.80%  
Short-Term Debt [1] $ 632 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2026 [Member] | Bank of China [Member]    
Debt Instrument, Face Amount [1] $ 705  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.60%  
Short-Term Debt [1] $ 705 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2026 [Member] | Industrial Bank [Member]    
Debt Instrument, Face Amount [1] $ 142  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.10%  
Short-Term Debt [1] $ 142 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2026 [Member] | Industrial and Commercial Bank of China [Member]    
Debt Instrument, Face Amount [1] $ 281  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.30%  
Short-Term Debt [1] $ 281 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2026 [Member] | China Citic Bank [Member]    
Debt Instrument, Face Amount [1] $ 4,915  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.30%  
Short-Term Debt [1] $ 4,915 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2026 [Member] | Bank of Hangzhou [Member]    
Debt Instrument, Face Amount [1] $ 4,213  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.50%  
Short-Term Debt [1] $ 4,213 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] $ 0 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] $ 0 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] $ 0 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] $ 0 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] $ 1,480 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] $ 1,875 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] $ 1,270 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] $ 705 685
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] $ 2,530 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due September 2026 Two [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 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] | China Merchants Bank [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] $ 1,410 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] $ 565 550
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] $ 2,040 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] $ 1,410 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] $ 2,740 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 2026 Two [Member] | NingBo Bank [Member]    
Debt Instrument, Face Amount [1] $ 428  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.80%  
Short-Term Debt [1] $ 428 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due August 2026 [Member] | Industrial and Commercial Bank of China [Member]    
Debt Instrument, Face Amount [1] $ 1,410  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.40%  
Short-Term Debt [1] $ 1,410 0
Beijing Tongmei Xtal Technology [Member] | Bank Loan Due August 2026 Two [Member] | Industrial and Commercial Bank of China [Member]    
Debt Instrument, Face Amount [1] $ 421  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.40%  
Short-Term Debt [1] $ 421 0
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] $ 0 2,740
Beijing Bouy Vessel [Member] | Bank Loan Due September 2026 [Member] | Bank of China [Member]    
Debt Instrument, Face Amount [1] $ 843  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.20%  
Short-Term Debt [1] $ 843 0
Beijing Bouy Vessel [Member] | Bank Loan Due September 2026 [Member] | China Merchants Bank [Member]    
Debt Instrument, Face Amount [1] $ 983  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.30%  
Short-Term Debt [1] $ 983 0
Beijing Bouy Vessel [Member] | Bank Loan Due September 2026 [Member] | Industrial and Commercial Bank of China [Member]    
Debt Instrument, Face Amount [1] $ 1,410  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.20%  
Short-Term Debt [1] $ 1,410 0
Beijing Bouy Vessel [Member] | Bank Loan Due September 2025 [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] $ 0 1,096
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] $ 0 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] $ 1,410 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] | NanJing Bank [Member]    
Debt Instrument, Face Amount [1] $ 1,370  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.80%  
Short-Term Debt [1] $ 1,410 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 Loans Due June 2026 [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
Beijing Bouy Vessel [Member] | Bank Loan Due August 2026 [Member] | Industrial and Commercial Bank of China [Member]    
Debt Instrument, Face Amount [1] $ 983  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.40%  
Short-Term Debt [1] $ 983 $ 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.