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Note 8 - Notes Payable (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2020 | Mar. 31, 2020 | Dec. 25, 2021 | Dec. 26, 2020
Property, Plant and Equipment, Gross, Ending Balance |  |  | $ 12,114,418 | $ 11,785,701
Interest Expense, Debt, Total |  |  | $ 10,886 |
Microscope Note Payable [Member] |  |  |  |
Debt Instrument, Term (Year) |  | 5 years |  |
Debt Instrument, Periodic Payment, Total |  | $ 4,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.47% |  |
Machine Vendor Financing [Member] |  |  |  |
Debt Instrument, Term (Year) | 2 years |  |  |
Debt Instrument, Periodic Payment, Total | $ 2,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.90% |  |  |
Notes Payable, Total | $ 40,000 |  |  |
Sonoscan Ultrasound Microscope [Member] |  |  |  |
Property, Plant and Equipment, Gross, Ending Balance |  | $ 208,000 |  |

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