Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Note 5 - Debt Obligations (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
Note 5 - Debt Obligations (Details Textual) - USD ($)	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020	Jan. 03, 2021	May 06, 2020
Line of Credit, Current	$ 15,000,000		$ 15,000,000		$ 15,000,000
Gain (Loss) on Extinguishment of Debt, Total	0	$ 0	1,192,000	$ 0
Heritage Bank of Commerce [Member] \| Paycheck Protection Program [Member]
Debt Instrument, Face Amount						$ 1,200,000
Debt Instrument, Interest Rate, Stated Percentage						1.00%
Gain (Loss) on Extinguishment of Debt, Total			1,200,000
Heritage Bank of Commerce [Member] \| Revolving Credit Facility [Member]
Line of Credit, Current	$ 15,000,000.0		$ 15,000,000.0		$ 15,000,000.0
Debt Instrument, Interest Rate, Effective Percentage	3.75%		3.75%		3.75%
Interest Expense, Debt, Total	$ 21,941	$ 28,146	$ 68,109	$ 270,521