Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - Components of the net pension expense for the Directors’ Plan: (Directors' Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Directors' Plan [Member]
Service cost	$ 80	$ 70	$ 66
Interest cost	110	124	130
Amortization of unrecognized gain	(29)	(54)	(58)
Amortization of past service liability	40	40	40
Net pension expense	201	180	178
Current actuarial loss (gain)	(44)	67	(23)
Amortization of actuarial gain	29	54	58
Amortization of prior service cost	(40)	(40)	(40)
Total recognized in other comprehensive income	(55)	81	(5)
Total recognized in net pension expense and other comprehensive income	$ 146	$ 261	$ 173