Note 4 - Retirement Plans (Detail) - Components of net periodic benefit cost for our pension plans (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Service cost	$ 1,325	$ 1,147
Interest cost	917	830
Expected return on plan assets	(830)	(682)
Loss amortization	742	576
Net periodic benefit cost	$ 2,154	$ 1,871