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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Sep. 25, 2021	Dec. 26, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 264,000	$ 175,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000	3,000
Preferred stock, shares issued	0	0
Common stock, par or stated value per share	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	92,175,206	91,059,407
Common stock, shares outstanding	89,546,489	85,443,378
Treasury stock, shares		2,564,155

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

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