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Certain Significant Estimates (Tables)
 12 Months Ended
Dec. 27, 2014
Product Warranty [Member] | Maximum [Member]  
Valuation and Qualifying Accounts Disclosure [Line Items]  
Valuation and Qualifying Accounts [Table Text Block]
Changes in product warranty were as follows:
 
In Thousands
 
2014
 
2013
 
2012
 
 
 
 
 
 
 
 
 
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]  
Valuation and Qualifying Accounts [Table Text Block]
Changes in inventory valuation reserves were as follows:
 
In Thousands
 
2014
 
2013
 
2012
 
 
 
 
 
 
 
 
 
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]  
Valuation and Qualifying Accounts [Table Text Block]
Changes in allowance for doubtful accounts were as follows:
 
In Thousands
 
2014
 
2013
 
2012
 
 
 
 
 
 
 
 
 
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]  
Valuation and Qualifying Accounts [Table Text Block]
Changes in customer allowances were as follows:
 
In Thousands
 
2014
 
2013
 
2012
 
 
 
 
 
 
 
 
 
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