Certain Significant Estimates (Tables)

12 Months Ended

Dec. 30, 2017

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	2017		2016		2015
Beginning balance	$	876	$	847	$	695
Additions		1,036		1,501		1,459
Deductions		(1,221)		(1,472)		(1,307)
Ending balance	$	691	$	876	$	847

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	2017		2016		2015
Beginning balance	$	415	$	471	$	537
Additions		288		327		470
Deductions		(199)		(383)		(536)
Ending balance	$	504	$	415	$	471

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	2017		2016		2015
Beginning balance	$	910	$	1,086	$	900
Additions		775		1,758		159
Deductions		(1,062)		(1,934)		27
Ending balance	$	623	$	910	$	1,086

Customer Allowances [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Valuation and Qualifying Accounts [Table Text Block]

Changes in customer allowances for advertising subsidies, volume rebates and catalog allowances were as follows:

In Thousands	2017		2016		2015
Beginning balance	$	2,777	$	2,151	$	2,155
Additions		6,608		5,778		5,312
Deductions		(6,028)		(5,152)		(5,316)
Ending balance	$	3,357	$	2,777	$	2,151