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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Sep. 26, 2020	Dec. 28, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 270,000	$ 938,000
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
Common Stock, Shares Authorized		120,000,000
Common Stock, Shares, Issued	89,506,296	88,912,796
Common Stock, Shares, Outstanding	82,596,416	82,536,416
Treasury stock, shares	4,513,256	4,513,256

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

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