Certain Significant Estimates (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Product Warranty [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 620	$ 523	$ 414
Additions	1,156	978	833
Deductions	(1,081)	(881)	(724)
Ending balance	695	620	523
Inventory Valuation Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	469	414	378
Additions	287	426	179
Deductions	(219)	(371)	(143)
Ending balance	537	469	414
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	1,104	787	698
Additions	251	475	91
Deductions	(455)	(158)	(2)
Ending balance	900	1,104	787
Customer Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	2,494	1,787	1,640
Additions	4,747	4,584	4,489
Deductions	(5,086)	(3,877)	(4,342)
Ending balance	$ 2,155	$ 2,494	$ 1,787

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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