SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (c) (e) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Allowance for doubtful accounts
Movement in valuation and qualifying accounts and reserves
Balance at Beginning of Period	$ 220,000	$ 235,000
Additions Charged to Costs and Expenses	280,000	63,000
Deductions - Describe	280,000	78,000
Balance at End of Period	220,000	220,000
Inventory valuation reserve
Movement in valuation and qualifying accounts and reserves
Balance at Beginning of Period	435,000	383,000
Additions Charged to Costs and Expenses	78,000	163,000
Deductions - Describe	201,000	111,000
Balance at End of Period	312,000	435,000
Reserve for self-insured losses
Movement in valuation and qualifying accounts and reserves
Balance at Beginning of Period	2,334,000	2,492,000
Additions Charged to Costs and Expenses	4,143,000	4,601,000
Deductions - Describe	4,616,000	4,759,000
Balance at End of Period	$ 1,861,000	$ 2,334,000