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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 28, 2021	Dec. 27, 2020
Statement Of Financial Position [Abstract]
Allowances on accounts receivable	$ 11	$ 47
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	200,000,000	200,000,000
Common stock, outstanding	27,636,000	24,323,000
Treasury stock, shares	9,612,000	9,612,000

X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

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-Topic 210
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Face amount or stated value per share of common stock.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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