Note 7 - Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended March 31,
	2017			2016
Service cost	$	1,196		$	1,077
Interest cost		1,339			1,307
Expected return on plan assets		(1,462	)		(1,325	)
Amortization of prior service benefit		(84	)		(84	)
Amortization of net loss		1,033			1,093
Net periodic benefit cost	$	2,022		$	2,068