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Note 8 - Notes Payable (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2020 | Dec. 30, 2023 | Dec. 31, 2022
Property, Plant and Equipment, Gross, Ending Balance |  |  | $ 13,210,514 | $ 12,708,959
Interest Expense, Debt |  |  | $ 5,096 | $ 7,954
Massachusetts Business Development Corporation [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument, Termination Period (Year) | 3 years |  |  |
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% |  |
Sonoscan Ultrasound Microscope [Member] |  |  |  |
Property, Plant and Equipment, Gross, Ending Balance |  | $ 208,000 |  |

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