Note 7 - Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended September 30,
	2015			2014
Service cost	$	1,054		$	1,020
Interest cost		1,206			1,186
Expected return on plan assets		(1,345	)		(1,249	)
Amortization of prior service cost		(84	)		(84	)
Amortization of net loss		1,065			756
Net periodic pension cost	$	1,896		$	1,629

	Nine Months Ended September 30,
	2015			2014
Service cost	$	3,162		$	3,060
Interest cost		3,618			3,558
Expected return on plan assets		(4,036	)		(3,747	)
Amortization of prior service cost		(253	)		(252	)
Amortization of net loss		3,195			2,268
Net periodic pension cost	$	5,686		$	4,887