Note 7 - Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended June 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 (gain) loss		1,093			1,065
Net periodic pension cost	$	2,068		$	1,896

	Six Months Ended June 30,
	2016			2015
Service cost	$	2,154		$	2,108
Interest cost		2,614			2,412
Expected return on plan assets		(2,650	)		(2,691	)
Amortization of prior service cost		(168	)		(169	)
Amortization of net (gain) loss		2,186			2,130
Net periodic pension cost	$	4,136		$	3,790