Long-Term Debt and Credit Arrangements (Term Loans ) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 26, 2020	Dec. 28, 2019
Debt Instrument [Line Items]
Notes payable - buildings	$ 5,900	$ 6,213
Debt Instrument, Covenant Compliance	As of the reporting date, the Company is in compliance with all such applicable covenants.
AmeriState Bank
Debt Instrument [Line Items]
Notes payable - buildings	$ 10,000
Long-term Debt, Term	25 years
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Debt Instrument, Interest Rate Terms	or 4.00% above 5-year treasury, to be reset every 5 years at 3.5% above 5-year treasury
Debt Instrument, Covenant Compliance	As of the reporting date, the Company is in compliance with all such covenants.
Greater Nevada Credit Union
Debt Instrument [Line Items]
Notes payable - buildings	$ 15,000
Long-term Debt, Term	10 years
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Debt Instrument, Interest Rate Terms	or 4.00% above 5- year treasury, to be reset after 5 years at 3.5% above 5-year treasury
Debt Instrument, Covenant Compliance	The loan requires certain compliance, affirmative, and financial covenants and, as of the reporting date, the Company is in compliance with all such covenants.

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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

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

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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