Note 4 - Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Service cost	$	1,325		$	1,147		$	2,649		$	2,295
Interest cost		917			830			1,834			1,660
Expected return on plan assets		(830	)		(682	)		(1,659	)		(1,365	)
Loss amortization		742			576			1,484			1,151
Net periodic benefit cost	$	2,154		$	1,871		$	4,308		$	3,741