Note 8 - Intangible Assets - Intangible Assets by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017	Apr. 01, 2017
Intangible assets, net	$ 87	$ 105	$ 105
Customer-Related Intangible Assets [Member]
Intangible assets, net	74		87
Noncompete Agreements [Member]
Intangible assets, net	$ 13		$ 18

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph ((a)(1),(b))
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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