Note 10 - Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three months ended						Nine months ended
	September 30,						September 30,
	2017			2016			2017			2016
Components of net periodic benefit cost
Interest cost	$	553		$	597		$	1,661		$	1,792
Expected return on plan assets		(677	)		(662	)		(2,031	)		(1,986	)
Recognized actuarial loss		199			194			599			582
Net periodic benefit cost	$	75		$	129		$	229		$	388

	Three months ended						Nine months ended
	September 30,						September 30,
	2017			2016			2017			2016
Components of net periodic benefit cost
Service cost	$	247		$	186		$	700		$	561
Interest cost		192			186			545			560
Recognized actuarial loss		94			49			268			147
Amortization of prior service benefit		(1	)		(1	)		(3	)		(3	)
Net periodic benefit cost	$	532		$	420		$	1,510		$	1,265