Note 7 - Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Costs of Retirement Plans [Table Text Block]

	Pension Benefits						Postretirement Benefits
	Three Months Ended September 30,						Three Months Ended September 30,
	2018			2017			2018			2017
Service cost	$	562		$	655		$	194		$	312
Interest cost		644			599			141			203
Expected return on plan assets		(1,073	)		(1,138	)		-			-
Amortization of prior service cost		-			-			(283	)		-
Recognized actuarial loss (gain)		388			436			(103	)		(168	)
Settlement loss		120			448			-			-
Net periodic benefit cost	$	641		$	1,000		$	(51	)	$	347

	Pension Benefits						Postretirement Benefits
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Service cost	$	1,857		$	2,078		$	582		$	937
Interest cost		1,882			1,918			422			610
Expected return on plan assets		(3,380	)		(3,525	)		-			-
Amortization of prior service cost		-			-			(847	)		-
Recognized actuarial loss (gain)		1,206			1,384			(310	)		(505	)
Settlement loss		2,736			3,841			-			-
Net periodic benefit cost	$	4,301		$	5,696		$	(153	)	$	1,042

Schedule of the Reclassification of Retirement Benefits [Table Text Block]

	Three			Nine
	Months ended September 30,
	2017			2017
Cost of products sold	$	(259	)	$	(2,416	)
Selling, general and administrative expenses		(120	)		(1,307	)
Total amount reclassified	$	(379	)	$	(3,723	)