Note 4 - Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Service cost	$	1,291		$	1,243		$	3,871		$	3,538
Interest cost		967			899			2,899			2,559
Expected return on plan assets		(926	)		(739	)		(2,774	)		(2,104	)
Loss amortization		824			624			2,468			1,775
Net periodic benefit cost	$	2,156		$	2,027		$	6,464		$	5,768