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Note 11 - Accumulated Other Comprehensive Income (Loss) (AOCI) (Details) - Components of Accumulated Other Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Dec. 27, 2014
Components of Accumulated Other Comprehensive Income (Loss) [Abstract]      
Pension liability adjustment(a) $ (28,555)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [1]   $ (29,615)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [1]
Pension liability adjustment(a) 74us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax [1] (44)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax  
Pension liability adjustment(a) 986us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax [1]    
Unrealized gain on investments(b) 12,747us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [2]   10,791us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [2]
Unrealized gain on investments(b) 1,956us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax [2]    
Unrealized gain on investments(b)    [2]    
Foreign currency translation adjustment (16,276)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax   (2,302)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Foreign currency translation adjustment (13,974)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax    
AOCI (loss) income (32,084)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax   (21,126)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
AOCI (loss) income (11,944)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax    
AOCI (loss) income $ 986us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax    
[1] Balances are net of tax of $12,397 and $12,857 for 2015 and 2014, respectively.
[2] Balances are net of tax of $0 and $0 for 2015 and 2014, respectively.