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Note 14 - Commitments and Contingencies (Details Textual) - USD ($)	9 Months Ended		12 Months Ended
	Oct. 02, 2016	Oct. 04, 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
Standard and Extended Product Warranty Accrual	851,000		$ 830,000
Product Warranty Expense	64,000	$ 112,000
Extended Product Warranty Accrual, Increase for Warranties Issued	245,000		$ 495,000
Purchase Obligation	9,346,000
Letters of Credit Outstanding, Amount	$ 66,000

X

- Definition

Represents contractual term of extended product warranty.

+ References

No definition available.

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- Definition

Amount of increase in the extended product warranty accrual from warranties issued. Excludes standard product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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- Definition

Amount of loss contingency liability.

+ References

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-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1)
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-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
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- Definition

The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3,4))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

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