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Note 11 - Notes Payable (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 28, 2024 | Dec. 30, 2023
Microscope Note Payable [Member] |  |  |
Debt Instrument, Term | 5 years |  |
Debt Instrument, Periodic Payment, Total | $ 4,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.47% |  |
Interest Expense, Total |  | $ 2,177 | $ 5,096
Sonoscan Ultrasound Microscope [Member] |  |  |
Property, Plant and Equipment, Gross, Ending Balance | $ 208,000 |  |

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