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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 27, 2020
Dec. 29, 2019
Statement Of Financial Position [Abstract]    
Allowances on accounts receivable $ 47 $ 202
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 200,000,000 200,000,000
Common stock, outstanding 24,323,000 23,638,000
Treasury stock, shares 9,612,000 9,465,000