Note 6 - Fair Value of Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements Using
(in thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Investments in equity securities	$	15,328	$	—	$	—	$	15,328
Mutual funds		9,950		—		—		9,950

	Fair Value Measurements Using
(in thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Investments in equity securities	$	10,993	$	—	$	—	$	10,993
Mutual funds		7,962		—		—		7,962

Fair Value, by Balance Sheet Grouping [Table Text Block]

	June 30 , 2018				December 30, 2017
(in thousands)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Euro Senior Notes, Series A due 2023	$	135,335	$	134,332	$	139,623	$	138,294
Euro Senior Notes, Series B due 2028		109,887		107,963		113,369		111,579
USD Senior Notes, Series A due 2022		25,000		24,154		25,000		24,737
USD Senior Notes, Series B due 2027		100,000		95,711		100,000		99,992
USD Senior Notes, Series A due 2025		50,000		47,769		—		—
USD Senior Notes, Series B due 2030		125,000		117,300		—		—