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Nature of Operations and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 27, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories, net of the valuation reserve, at fiscal year-ends were as follows:
 
In Thousands
 
2014
 
2013
 
 
 
 
 
 
 
Raw materials
 
$
3,950
 
$
3,317
 
Work in process
 
 
3,967
 
 
3,357
 
Finished goods
 
 
15,858
 
 
12,267
 
 
 
$
23,775
 
$
18,941
 
Property, Plant and Equipment [Table Text Block]
Property, plant and equipment consist of the following:
 
In Thousands
 
2014
 
2013
 
 
 
 
 
 
 
Land
 
$
2,049
 
$
2,049
 
Buildings and leasehold improvements
 
 
16,951
 
 
16,028
 
Machinery and equipment
 
 
19,852
 
 
17,927
 
Total cost
 
 
38,852
 
 
36,004
 
Accumulated depreciation and amortization
 
 
(27,256)
 
 
(25,369)
 
 
 
$
11,596
 
$
10,635
 
Investments in and Advances to Affiliates [Table Text Block]
Investments are composed of the following:
 
In Thousands
 
2014
 
2013
 
 
 
 
 
 
 
 
 
Non-marketable equity investments (equity method)
 
$
18,949
 
$
19,455
 
Schedule of Other Nonoperating Income, by Component [Table Text Block]
The components of Other Income are as follows:
 
In Thousands
 
2014
 
2013
 
2012
 
 
 
 
 
 
 
 
 
Income from non-marketable equity investments accounted for on the equity method
 
$
3,923
 
$
2,934
 
$
2,998
 
Royalty income from patents
 
 
—
 
 
—
 
 
30
 
Proceeds from insurance for involuntary conversion
 
 
603
 
 
—
 
 
—
 
Rent income from real estate
 
 
106
 
 
—
 
 
—
 
Other
 
 
94
 
 
—
 
 
—
 
 
 
$
4,726
 
$
2,934
 
$
3,028