Note 4 - Other Investments (Details)	3 Months Ended		9 Months Ended
	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($)	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($)	Sep. 27, 2014 EUR (€)	Dec. 28, 2013 USD ($)	Dec. 28, 2013 EUR (€)
Equity Method Investments and Joint Ventures [Abstract]
Marketable Securities, Equity Securities	$ 13,100,000		$ 13,100,000		€ 10,200,000	$ 12,300,000	€ 9,000,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (1,773,000)	$ (532,000)	$ 1,811,000	$ 546,000