Certain Significant Estimates (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Product Warranty [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 695	$ 620	$ 523
Additions	1,459	1,156	978
Deductions	(1,307)	(1,081)	(881)
Ending balance	847	695	620
Inventory Valuation Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	537	469	414
Additions	470	287	426
Deductions	(536)	(219)	(371)
Ending balance	471	537	469
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	900	1,104	787
Additions	159	251	475
Deductions	27	(455)	(158)
Ending balance	1,086	900	1,104
Customer Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	2,155	2,494	1,787
Additions	5,312	4,747	4,584
Deductions	(5,316)	(5,086)	(3,877)
Ending balance	$ 2,151	$ 2,155	$ 2,494

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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