Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Narrative) (Details)	12 Months Ended
	Jan. 02, 2021 USD ($) hour shares	Dec. 28, 2019 USD ($)	Aug. 31, 2019 USD ($)	May 31, 2007 shares	Jan. 01, 2007 shares
Schedule of Shareholders' Equity [Line Items]
Accumulated other comprehensive income (loss)	$ (9,153,000)	$ (8,073,000)
Term of employment agreement	2 years
Certain officers
Schedule of Shareholders' Equity [Line Items]
Change in control percentage	20.00%
Percent of board members	0.3333
Term of employment agreement	2 years
Number of times annual salary	200.00%
Corporation's Chairman, President and CEO
Schedule of Shareholders' Equity [Line Items]
Number of times annual salary	300.00%
Director plan
Schedule of Shareholders' Equity [Line Items]
Available for future issuance (shares) | shares				300,000
Purchase Plan
Schedule of Shareholders' Equity [Line Items]
Available for future issuance (shares) | shares					800,000
Rights to purchase stock, minimum working hours per week | hour	20
Rights to purchase stock, minimum working months per year	5 months
Price of repurchased stock as percent of closing price on the exercise date	85.00%
Maximum amount fair value for purchase of common stock	$ 25,000
Shares available for future issuance (shares) | shares	500,522
Interest rate swap
Schedule of Shareholders' Equity [Line Items]
Derivative notional amount			$ 75,000,000
Fixed interest rate			1.42%
Derivative financial instruments - liability	$ 2,300,000
Accumulated other comprehensive income (loss)	(1,800,000)
Common Stock
Schedule of Shareholders' Equity [Line Items]
Remaining authorized repurchase amount	$ 158,300,000