Income Taxes - Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020
Income Taxes
Balance at the beginning of the period	$ 1,030,000	$ 1,579,000
Additions for tax positions of prior years	81,000	60,000
Reductions for tax positions of prior years	(215,000)	(426,000)
Reductions for lapse of statute of limitations		(183,000)
Balance at the end of the period	896,000	1,030,000
Income tax expense, accrued interest and penalties	$ 132,000	$ 136,000