Note 11 - Accumulated Other Comprehensive Income (Loss) (AOCI) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 26, 2015	Sep. 26, 2015
Pension liability adjustment(a)	[1]		$ (29,615)
Pension liability adjustment(a)		$ (16)	(140)	[1]
Pension liability adjustment(a)		(514)	1,457	[1]
Pension liability adjustment(a)		21,124	21,124	[1]
Pension liability adjustment(a)	[1]	(7,174)	(7,174)
Unrealized gain (loss) on investments(b)	[2]		10,791
Unrealized gain (loss) on investments(b)	[2]		(18)
Unrealized gain (loss) on investments(b)	[2]	10,773	10,773
Foreign currency translation adjustment			(2,302)
Foreign currency translation adjustment			(36,530)
Foreign currency translation adjustment		(38,832)	(38,832)
AOCI (loss) income			(21,126)
AOCI (loss) income			(36,688)
AOCI (loss) income			1,457
AOCI (loss) income			21,124
AOCI (loss) income		$ (35,233)	$ (35,233)

[1] Balances are net of tax of $3,115 and $12,587 for 2015 and 2014, respectively.

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