Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - Assumptions used to determine benefit obligations and periodic pension expense for the Directors’ Plan:	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Weighted average discount rate for periodic pension benefit expense	4.25%	5.75%	5.75%
Directors' Plan [Member]
Weighted average discount rate for the benefit obligation	3.75%	4.25%	5.25%
Weighted average discount rate for periodic pension benefit expense	4.25%	5.25%	5.75%