Note 7 - Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Costs of Retirement Plans [Table Text Block]

	Pension Benefits						Postretirement Benefits
	Three Months Ended March 31 ,						Three Months Ended March 31 ,
	2019			2018			2019			2018
Service cost	$	567		$	693		$	271		$	194
Interest cost		646			606			235			141
Expected return on plan assets		(945	)		(1,204	)		-			-
Amortization of prior service cost		-			-			(282	)		(283	)
Recognized actuarial loss (gain)		391			397			7			(103	)
Settlement loss		-			387			-			-
Net periodic benefit cost	$	659		$	879		$	231		$	(51	)