Note 2 - Acquisition of Businesses (Details) (USD $)	6 Months Ended		0 Months Ended				1 Months Ended	0 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 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. 28, 2014 Hamlin, Inc. [Member]	Jun. 29, 2013 Hamlin, Inc. [Member]	Jun. 28, 2014 Hamlin, Inc. [Member]	May 31, 2013 Selco A/S [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
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			1.7
Business Combination, Consideration Transferred											144,400,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual												14,700,000		36,500,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual												$ 900,000		$ 1,200,000