Note 6 - Acquisitions (Details) - Maximum Deferred Consideration Payments (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014
January 3, 2015 [Member] | BGA [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	$ 88
January 3, 2015 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	88
January 2, 2016 [Member] | BGA [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	222
January 2, 2016 [Member] | PCI [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	261
January 2, 2016 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	483
December 31, 2016 [Member] | BGA [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	307
December 31, 2016 [Member] | PCI [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	197
December 31, 2016 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	504
December 30, 2017 [Member] | PCI [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	307
December 30, 2017 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	307
Estimated Future Payments [Member] | BGA [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	617
Estimated Future Payments [Member] | PCI [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	765
Estimated Future Payments [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	$ 1,382