SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Allowance for doubtful accounts
Movement in valuation and qualifying accounts and reserves
Balance at Beginning of Period	$ 410,000	$ 140,000
Additions Charged to Costs and Expenses	189,000	68,000
Deductions - Describe	105,000	(202,000)
Balance at End of Period	494,000	410,000
Inventory Valuation Reserve
Movement in valuation and qualifying accounts and reserves
Balance at Beginning of Period	1,747,000	518,000
Additions Charged to Costs and Expenses	138,000	1,544,000
Deductions - Describe	862,000	315,000
Balance at End of Period	1,023,000	1,747,000
Reserve for Self Insured Losses
Movement in valuation and qualifying accounts and reserves
Balance at Beginning of Period	2,451,000	1,881,000
Additions Charged to Costs and Expenses	3,261,000	5,483,000
Deductions - Describe	3,745,000	4,913,000
Balance at End of Period	$ 1,967,000	$ 2,451,000