Schedule II - Valuation and Qualifying accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)		12 Months Ended
		Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 430,000	$ 450,000	$ 414,000
Charged to Costs and Expenses		87,000	0	52,000
Charged to Other Accounts - Describe		64,000
Deductions - Describe	[1]	111,000	20,000	16,000
Balance at End of Period		$ 470,000	$ 430,000	$ 450,000

[1] Uncollectible accounts written off, net of recoveries.