Summary of Significant Accounting Policies (Details Textual) (USD $)	3 Months Ended
	Mar. 29, 2013 Vertical_Market_Focus_Areas Segment	Mar. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, equipment and capitalized software	$ 27,416,000		$ 26,905,000
Accumulated depreciation and amortization	(20,460,000)		(19,989,000)
Property, equipment and capitalized software, net	6,956,000		6,916,000
Depreciation and amortization expense	631,000	648,000
Summary of Significant Accounting Policies (Additional Textual)
Number of operating segments	1
Number of vertical market focus areas	4
Cash and cash equivalents	30,745,000	19,265,000	40,614,000	22,414,000
Gross cash surrender value of life insurance	25,100,000		24,800,000
Loan on cash surrender value of life insurance	23,400,000		23,100,000
Net cash surrender value	1,700,000		1,700,000
Total death benefit on life insurance contracts	37,100,000		37,100,000
Life insurance proceeds to be received upon death of participants	13,200,000
Life insurance gain to be recognized upon death of participants	12,000,000
Capitalized computer software, additions (less than $0.1 million in quarter ended March 29, 2013)	100,000	0
Accumulated amortization	3,500,000	1,800,000
Amount of guarantees	2,400,000		2,500,000
Minimum [Member]
Property, Plant and Equipment [Line Items]
Capitalized Computer Software Amortization Period	2 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Capitalized Computer Software Amortization Period	5 years
Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Property, equipment and capitalized software	5,100,000	5,100,000
Depreciation and amortization expense	$ 300,000	$ 400,000