Note 7 - Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended September 30,
	2016			2015
Service cost	$	1,077		$	1,054
Interest cost		1,307			1,206
Expected return on plan assets		(1,325	)		(1,345	)
Amortization of prior service cost		(84	)		(84	)
Amortization of net loss		1,093			1,065
Net periodic pension cost	$	2,068		$	1,896

	Nine Months Ended September 30,
	2016			2015
Service cost	$	3,231		$	3,162
Interest cost		3,921			3,618
Expected return on plan assets		(3,975	)		(4,036	)
Amortization of prior service cost		(252	)		(253	)
Amortization of net loss		3,279			3,195
Net periodic pension cost	$	6,204		$	5,686