Note 7 - Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended March 31,
	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 benefit		(84	)		(84	)
Amortization of net loss		1,065			756
Net periodic benefit cost	$	1,896		$	1,629