Note 5 - Employee Benefit Plans (Detail) - Components of Net Periodic Benefit Cost for the Noncontributory Defined Benefit Pension Plan (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Service cost	$ 620	$ 620
Interest cost	1,032	1,032
Expected return on plan assets	(994)	(994)
Amortization of prior service cost	10	10
Recognized actuarial loss	982	831
Net periodic benefit cost	$ 1,650	$ 1,499