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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.

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