Note 5 - Fair Value of Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2017

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
Investment in Polytronics	$	10,582	$	—	$	—	$	10,582

	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
Investment in Polytronics	$	10,435	$	—	$	—	$	10,435

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

	September 30 , 2017				December 31, 2016
(in thousands )	Carrying Value		Estimated Fair Value		Carrying V alue		Estimated Fair Value
Euro Senior Notes, Series A due 2023	$	137,670	$	137,581	$	122,313	$	122,586
Euro Senior Notes, Series B due 2028		111,784		110,550		99,314		99,230
USD Senior Notes, Series A due 2022		25,000		24,938		—		—
USD Senior Notes, Series B due 2027		100,000		99,884		—		—