Note 6 - Acquisitions (Detail) - Maximum Deferred Consideratoin Payments (PSG [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
PSG [Member]
Estimated contingent consideration payments	$ 307	$ 269	$ 253	$ 228	$ 1,057

Amount of potential cash payments that could result from the contingent consideration arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionContingentConsiderationPotentialCashPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant