Note 18 - Selected Quarterly Financial Data (Unaudited) (Details Textual) - USD ($)	3 Months Ended									6 Months Ended	12 Months Ended
	Jan. 02, 2016	Jan. 02, 2016	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jun. 28, 2014	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013
Facility Relocation [Member]
Restructuring Charges		$ 2,100,000	$ 1,200,000	$ 900,000	$ 1,000,000
Sym Com Inc [Member]
Business Combination, Acquisition Related Costs								$ 200,000
Noncash Charges Related To Inventory Stepup								1,400,000	$ 1,400,000	$ 1,400,000
Severance Costs								$ 2,000,000
Restructuring Charges						$ 2,200,000	$ 1,100,000
Legal Fees		(100,000)	900,000	1,700,000	1,200,000
Business Combination, Acquisition Related Costs		4,000,000	300,000	200,000	200,000	300,000					$ 4,600,000	$ 500,000	$ 1,700,000
Premium Refund of Annuity Contract	$ 300,000	(300,000)
Other Nonrecurring (Income) Expense		$ (300,000)	100,000
Defined Benefit Plan, Settlements, Benefit Obligation			$ 30,800,000	$ 700,000	$ 700,000
Asset Impairment Charges						$ 300,000					$ 0		$ 0