Significant Accounting Policies (Details) - USD ($)	Dec. 31, 2016	Jan. 02, 2016
Allowance for doubtful receivables	$ 1,081,000	$ 367,000
Customer C
Allowance for doubtful receivables	800,000	0
Customer E
Allowance for doubtful receivables	198,000	0
Customer A
Allowance for doubtful receivables	0	329,000
Other Allowances
Allowance for doubtful receivables	$ 83,000	$ 38,000