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

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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