Note 15 - Business Unit Segment Information (Details) (USD $)	3 Months Ended	12 Months Ended											3 Months Ended	12 Months Ended	3 Months Ended			12 Months Ended	3 Months Ended
	Dec. 29, 2012	Dec. 31, 2013		Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2012		Dec. 31, 2011		Dec. 28, 2013 Geographic Concentration Risk [Member] Sales Revenue, Goods, Net [Member]	Dec. 31, 2011 Des Plaines [Member]	Dec. 31, 2011 Dundalk [Member]	Sep. 29, 2012 Dunsen [Member]	Dec. 31, 2011 Dunsen [Member]	Mar. 30, 2013 Shocking [Member]	Dec. 29, 2012 Shocking [Member]	Dec. 29, 2012 Shocking [Member]	Dec. 28, 2013 China [Member] Sales Revenue, Goods, Net [Member]	Dec. 29, 2012 Shocking [Member]
Note 15 - Business Unit Segment Information (Details) [Line Items]
Number of Operating Segments				3
Business Combination, Acquisition Related Costs				$ 1,700,000	$ 900,000			$ 1,000,000
Business Acquisition, Inventory Step-up	600,000			1,500,000	600,000			3,700,000
Pension Expense	5,300,000				5,100,000
Asset Impairment Charges				0	500,000			2,300,000			800,000	600,000	500,000	900,000			7,300,000
Finite-Lived Intangible Assets, Purchase Accounting Adjustments								700,000
Other than Temporary Impairment Losses, Investments															10,700,000	3,300,000
Impairment And Equity In Net Loss Of Unconsolidated Affiliate		$ 10,678,000	[1]	$ 10,678,000	$ 7,334,000	$ 7,334,000	[1]		[1]										$ 7,300,000
Concentration Risk, Percentage										64.00%								20.00%

[1] During the first quarter of 2013, the company recorded approximately $10.7 million related to the impairment of Shocking Technologies. During the fourth quarter of 2012, the company recorded approximately $7.3 million related to the impairment and equity in net loss of its investment in Shocking Technologies (See Note 6).