Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - For the Postretirement Plans, the change in benefit obligation and assets: (Postretirement Plans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Postretirement Plans [Member]
Change in benefit obligation:
Projected benefit obligation, balance	$ 5,166	$ 4,013
Service cost	400	313	271
Interest cost	217	207	210
Actuarial loss (gain)	211	686
Benefits paid	(67)	(53)
Projected benefit obligation, balance	5,927	5,166	4,013
Change in plan assets:
Employer contributions	67	53
Benefits paid	(67)	(53)
Accrued pension cost included in other liabilities	$ (5,927)	$ (5,166)