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Note 12 - Commitments and Contingencies (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 03, 2016 | Apr. 05, 2015 | Dec. 31, 2015
Link Encryption Products [Member] | Minimum [Member] |  |  |
Extended Product Warranty Term | 3 years |  |
Link Encryption Products [Member] | Maximum [Member] |  |  |
Extended Product Warranty Term | 5 years |  |
Minimum [Member] |  |  |
Loss Contingency, Estimate of Possible Loss | $ 0 |  |
Maximum [Member] |  |  |
Loss Contingency, Estimate of Possible Loss | 4,000,000 |  |
Accrued Liabilities [Member] |  |  |
Loss Contingency Accrual | 500,000 |  |
Accrual for Environmental Loss Contingencies | 0 |  | $ 0
Standard and Extended Product Warranty Accrual | 867,000 |  | 830,000
Product Warranty Expense | 37,000 | $ 64,000 |
Extended Product Warranty Accrual, Increase for Warranties Issued | 413,000 |  | $ 495,000
Purchase Obligation | $ 8,236,000 |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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