Note 6 - Acquisitions (Details) - Maximum Deferred Consideration Payments (USD $) In Thousands, unless otherwise specified	Apr. 04, 2015
January 2, 2016 [Member] | BGA [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	$ 127
January 2, 2016 [Member] | PCI [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	262
January 2, 2016 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	389
December 31, 2016 [Member] | BGA [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	271
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	468
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	398
Estimated Future Payments [Member] | PCI [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	766
Estimated Future Payments [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated contingent consideration payments	$ 1,164