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Note K - Notes Payable and Long-term Debt (Details Textual) $ in Millions | May 24, 2024 USD ($) | Jun. 07, 2022 USD ($) | May 24, 2019 USD ($) | Dec. 31, 2024 USD ($) | May 24, 2024 CNY (¥) | Dec. 31, 2023 USD ($) | Jun. 07, 2022 CNY (¥) | May 24, 2019 CNY (¥) | May 08, 2019 USD ($) | May 07, 2019 CNY (¥) | Apr. 30, 2019 CNY (¥)
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Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  | $ 24.8 |  | $ 22.5 |  |  |  |  |
Cash Collateral for Borrowed Securities |  |  |  | 8.5 |  | 9.7 |  |  |  |  |
SPD Bank [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 23,600.0 |  | 23,600.0 |  |  |  |  |
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] | The SPD 30M Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | ¥ |  |  |  |  |  |  |  |  |  | ¥ 30,000,000 |
SPD Bank [Member] | Global Technology, Inc. [Member] | Revolving Credit Facility [Member] | The SPD 9.9M Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 9,900,000
SPD Bank [Member] | Global Technology, Inc. [Member] | Revolving Credit Facility [Member] | The SPD 2.0M Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | $ 2.0 |  |
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 |  |  |  |  |  |
Long-Term Line of Credit |  |  |  | 13.5 |  |  |  |  |  |  |
Bank Acceptances Executed |  |  |  | 11.3 |  |  |  |  |  |  |
China Zheshang Bank Co., Ltd [Member] | Revolving Credit Facility [Member] | The ¥200M Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 27,800.0 |  | $ 27,800.0 |  |  |  |  |
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 |  |  |  | 13.2 |  |  |  |  |  |  |
Bank Acceptances Executed |  |  |  | $ 7.9 |  |  |  |  |  |  |

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