Income Taxes - Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Income Taxes
Balance at the beginning of the period	$ 2,023,000	$ 2,028,000
Additions for tax positions of prior years	179,000	510,000
Reductions for tax positions of prior years	(623,000)	(515,000)
Balance at the end of the period	1,579,000	2,023,000
Interest expense (benefit) included in income tax expense	11,000	(39,000)
Income tax expense, accrued interest and penalties	$ 154,000	$ 165,000