Note 5 - Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2014

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
Service cost	$	1,300		$	1,325		$	2,644		$	2,649
Interest cost		1,034			917			2,103			1,834
Expected return on plan assets		(1,057	)		(830	)		(2,151	)		(1,659	)
Loss amortization		244			742			496			1,484
Net periodic benefit cost	$	1,521		$	2,154		$	3,092		$	4,308