Note 5 - Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2014

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014			2013
Service cost	$	1,279		$	1,291		$	3,886		$	3,871
Interest cost		1,099			967			3,336			2,899
Expected return on plan assets		(1,123	)		(926	)		(3,410	)		(2,774	)
Loss amortization		263			824			799			2,468
Net periodic benefit cost	$	1,518		$	2,156		$	4,611		$	6,464