Income Taxes (Narrative) (Details) (USD $)	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011
Operating Loss Carryforwards [Line Items]
Cumulative unremitted foreign earnings	$ 1,000,000
Unrecognized tax benefits that would affect effective tax rate if recognized	79,000
Accrued interest and penalties related to uncertain tax positions	33,000	26,000	20,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	107,100,000
Operating loss carryforwards that will result in credits to stockholders equity	8,000,000
Federal [Member] | Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	2,600,000
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	47,000,000
Operating loss carryforwards that will result in credits to stockholders equity	5,100,000
State [Member] | Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	$ 3,600,000