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

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