Note 11 - Employee Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Pension benefits				Postretirement benefits
	Three months ended March 31,				Three months ended March 31,
	2016		2015		2016		2015
Service cost	$	22	$	23	$	2	$	3
Interest cost		31		36		7		8
Expected return on plan assets		(42)		(45)
Amortization of net loss								1
Amortization of prior service cost (credit)		1		2		(1)		(1)
Recognition of actuarial loss		7
Total pension and postretirement benefit expense	$	19	$	16	$	8	$	11