Note 6 - Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
Service cost	$	-		$	-		$	-		$	-
Interest cost		1,528			1,185			2,335			2,369
Expected return on plan assets		(1,848	)		(1,298	)		(2,824	)		(2,595	)
Loss amortization		158			153			242			306
Net periodic cost	$	(162	)	$	40		$	(247	)	$	80