Note 7 - Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jul. 01, 2017 USD ($)
Balance	$ 814,931
Balance	895,432
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(11,983)	[1]
Activity in the period	(381)
Balance	(12,364)	[1]
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Balance	10,769
Activity in the period	475
Balance	11,244
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(73,365)
Activity in the period	1,381
Balance	(71,984)
Accumulated Other-than-Temporary Impairment Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(74,579)
Activity in the period	1,475
Balance	$ (73,104)

[1] The balances at July 1, 2017 and December 31, 2016 are net of taxes of $1.1 million and $1.1 million, respectively.