Note 11 - Employee Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Pension benefits								Postretirement benefits
	Three months ended September 30,				Nine months ended September 30,				Three months ended September 30,				Nine months ended September 30,
	2015		2014		2015		2014		2015		2014		2015		2014
Service cost	$	22	$	30	$	67	$	62	$	3	$	4	$	10	$	9
Interest cost		36		42		109		118		8		10		24		28
Expected return on plan assets		(44)		(45)		(133)		(131)
Amortization of net loss										1				3
Amortization of prior service cost (credit)		2		1		5		4		(2)		(3)		(5)		(5)
Recognition of actuarial loss						8
Total pension and postretirement benefit expense	$	16	$	28	$	56	$	53	$	10	$	11	$	32	$	32