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Nature of Operations and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of investments in and advances to affiliates. Does not include the tabular disclosure of the disaggregation of investments in and advances to affiliates across legal entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611322-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Article 12 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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