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Note 17 - Leases (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 30, 2020
Finance Lease, Weighted Average Discount Rate, Percent | 3.95% | 0.00% |  |
Related Party | Building Leases | Quingdao |  |  |  |
Lessee, Operating Lease, Term of Contract | 5 years |  |  |
Related Party | Building Leases | Shenzen |  |  |  |
Lessee, Operating Lease, Term of Contract | 7 years |  |  |
Nonrelated Party | Building Leases | Shenzen |  |  |  |
Lessee, Operating Lease, Term of Contract | 50 years |  |  | 50 years
Qingdao | Related Party |  |  |  |
Lessor, Operating Lease, Term of Contract |  |  | 10 years |
Operating Lease, Lease Income, Lease Payments | $ 135,604 | $ 138,727 | $ 157,786 |

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