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Note 14 - Segment Information - Total Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016	Jul. 02, 2016
Total assets	$ 65,626	$ 69,831	$ 70,741
UNITED STATES
Total assets	48,353	53,842
CANADA
Total assets	15,204	13,953
PUERTO RICO
Total assets	$ 2,069	$ 2,036

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CA
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Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_PR
Namespace Prefix:
Data Type:	na
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Period Type: