Note 11 - Employee Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Pension benefits								Postretirement benefits
	Three months ended June 30,				Six months ended June 30,				Three months ended June 30,				Six months ended June 30,
	2016		2015		2016		2015		2016		2015		2016		2015
Service cost	$	21	$	22	$	43	$	45	$	2	$	4	$	4	$	7
Interest cost		31		37		62		73		6		8		13		16
Expected return on plan assets		(41)		(44)		(83)		(89)
Amortization of net loss												1				2
Amortization of prior service cost (credit)		2		1		3		3		(1)		(2)		(2)		(3)
Recognition of actuarial loss		28		8		35		8
Total pension and postretirement benefit expense	$	41	$	24	$	60	$	40	$	7	$	11	$	15	$	22