Note 11 - Accumulated Other Comprehensive Income (Loss) (AOCI) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 27, 2015	Jun. 27, 2015		Dec. 27, 2014
Pension liability adjustment(a)	[1]	$ (27,768)	$ (27,768)		$ (29,615)
Pension liability adjustment(a)		(198)	(124)	[1]
Pension liability adjustment(a)		985	1,971	[1]
Unrealized gain on investments(b)	[2]	14,127	14,127		10,791
Unrealized gain on investments(b)	[2]		3,336
Foreign currency translation adjustment		(12,455)	(12,455)		(2,302)
Foreign currency translation adjustment			(10,153)
AOCI (loss) income		$ (26,096)	(26,096)		$ (21,126)
AOCI (loss) income			(6,941)
AOCI (loss) income			$ 1,971

[1] Balances are net of tax of $12,055 and $12,857 for 2015 and 2014, respectively.

[2] Balances are net of tax of $0 and $0 for 2015 and 2014, respectively.