Note 2 - Acquisition of Businesses (Details) (USD $)	9 Months Ended		0 Months Ended				1 Months Ended	0 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Jan. 03, 2014 Trademarks [Member] SymCom, Inc. [Member] Minimum [Member]	Jan. 03, 2014 Trademarks [Member] SymCom, Inc. [Member] Maximum [Member]	Jan. 03, 2014 Patents [Member] SymCom, Inc. [Member] Minimum [Member]	Jan. 03, 2014 Patents [Member] SymCom, Inc. [Member] Maximum [Member]	May 31, 2013 Distribution Network, Trademarks and Patents [Member] Hamlin, Inc. [Member]	Jan. 03, 2014 SymCom, Inc. [Member]	Jun. 28, 2014 SymCom, Inc. [Member]	Mar. 29, 2014 SymCom, Inc. [Member]	May 31, 2013 Hamlin, Inc. [Member]	Jun. 29, 2013 Hamlin, Inc. [Member]
Note 2 - Acquisition of Businesses (Details) [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired								100.00%			100.00%
Payments to Acquire Businesses, Net of Cash Acquired	$ 52,768,000	$ 145,000,000						$ 52,800,000			$ 144,400,000
Finite-Lived Intangible Asset, Useful Life			15 years	20 years	16 years	17 years	10 years
Business Acquisition, Inventory Step-up								2,600,000	2,800,000		2,100,000
Non-cash Charges Related to Inventory Step-up									$ 1,400,000	$ 1,400,000		$ 1,700,000