Income Taxes (Details Textual) (USD $)	12 Months Ended	3 Months Ended
	Jan. 03, 2015	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Release of deferred tax assets valuation allowance	$ (9,200,000)
Accrued interest and penalties	0	0
Ending balance of unrecognized tax benefits	861,000	861,000	1,027,000	954,000	1,191,000
Unrecognized tax benefits recognition impact on income tax rate	861,000	861,000
Earliest Tax Year
Income Taxes [Line Items]
Open Tax Year	2009
Latest Tax Year
Income Taxes [Line Items]
Open Tax Year	2014
Federal
Income Taxes [Line Items]
Release of deferred tax assets valuation allowance		(9,200,000)
Net operating loss	12,500,000	12,500,000
Stock option deduction	2,000,000	2,000,000
Net operating loss expiration year	2032
Research credit	1,300,000	1,300,000
Tax credit carryforward expiration year	2026
State
Income Taxes [Line Items]
Net operating loss	14,500,000	14,500,000
Stock option deduction	2,100,000	2,100,000
Net operating loss expiration year	2020
Research credit	$ 1,900,000	$ 1,900,000