Certain Significant Estimates (Tables)

12 Months Ended

Dec. 26, 2015

Product Warranty [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Valuation and Qualifying Accounts [Table Text Block]

Changes in product warranty were as follows:

In Thousands	2015		2014		2013
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]

Valuation and Qualifying Accounts [Table Text Block]

Changes in inventory valuation reserves were as follows:

In Thousands	2015		2014		2013
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]

Valuation and Qualifying Accounts [Table Text Block]

Changes in allowance for doubtful accounts were as follows:

In Thousands	2015		2014		2013
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]

Valuation and Qualifying Accounts [Table Text Block]

Changes in customer allowances were as follows:

In Thousands	2015		2014		2013
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