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Note 11 - Notes Payable and Long-term Debt (Details Textual) $ in Millions | Jun. 26, 2025 USD ($) | Jun. 12, 2025 USD ($) | May 24, 2024 USD ($) | Jun. 07, 2022 USD ($) | May 24, 2019 USD ($) | Jun. 30, 2025 USD ($) | Jun. 26, 2025 CNY (¥) | Jun. 12, 2025 CNY (¥) | Dec. 31, 2024 USD ($) | May 24, 2024 CNY (¥) | Jun. 07, 2022 CNY (¥) | May 24, 2019 CNY (¥)
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Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  |  | $ 31.2 |  |  | $ 24.8 |  |  |
Cash Collateral for Borrowed Securities |  |  |  |  |  | 22.5 |  |  | 8.5 |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |
SPD Bank [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 24.3 |  |  | 24.3 |  |  |
SPD Bank [Member] | Revolving Credit Facility [Member] | Renewed SPD Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 22.7 |  |  | 22.7 |  |  |
SPD Bank [Member] | Global Technology, Inc. [Member] | Revolving Credit Facility [Member] | The SPD Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  | 5 years |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 25.4 |  |  |  |  |  |  | ¥ 180,000,000
SPD Bank [Member] | Global Technology, Inc. [Member] | Revolving Credit Facility [Member] | Renewed SPD Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  | 5 years |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 23.9 |  |  |  |  |  |  | ¥ 170,000,000 |  |
China Zheshang Bank Co., Ltd [Member] | Revolving Credit Facility [Member] | The ¥200M Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 28.5 |  |  | $ 28.5 |  |  |
China Zheshang Bank Co., Ltd [Member] | Global Technology, Inc. [Member] | Revolving Credit Facility [Member] | The ¥50M Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |
China Zheshang Bank Co., Ltd [Member] | Global Technology, Inc. [Member] | Revolving Credit Facility [Member] | The ¥200M Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 29.9 |  |  |  |  |  |  | ¥ 200,000,000 |
Long-Term Line of Credit |  |  |  |  |  | 8.7 |  |  |  |  |  |
Bank Acceptances Executed |  |  |  |  |  | 24.0 |  |  |  |  |  |
China Construction Bank Co., Ltd. [Member] | Global Technology, Inc. [Member] | Revolving Credit Facility [Member] | CCB Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) | 5 years |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 22.7 |  |  |  |  |  | ¥ 162,260,000 |  |  |  |  |
Long-Term Line of Credit |  |  |  |  |  | $ 13.5 |  |  |  |  |  |
China Construction Bank Co., Ltd. [Member] | Global Technology, Inc. [Member] | Line of Credit [Member] | CCB Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  | 1 year |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 13.5 |  |  |  |  |  | ¥ 96,800,000 |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.05% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.00% |  |  |  |  |  | 3.00% |  |  |  |

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