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Note 10 - Commitments and Contingencies (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Oct. 01, 2020 ft² | Mar. 31, 2020 USD ($)
Operating Lease, Weighted Average Remaining Lease Term (Year) | 2 years 9 months | 3 years 9 months |  |
Operating Lease, Weighted Average Discount Rate, Percent | 6.00% | 6.00% |  |
Operating Lease, Right-of-Use Asset | $ 226,704 | $ 298,485 |  |
Operating Lease, Liability | 279,312 | 365,712 |  |
Cash | 1,731,155 |  |  |
Estimated Litigation Liability |  |  |  | $ 450,000
PDN China [Member] |  |  |  |
Cash | 0 | 184,055 |  |
Office Lease [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  | 4,902 |
Lessee, Operating Lease, Term of Contract (Year) |  |  | 84 years |
Operating Lease, Payments | $ 106,000 | $ 104,000 |  |

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