Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - For the Retirement Plan, the change in benefit obligation and assets: (Retirement Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Retirement Plan [Member]
Change in benefit obligation:
Projected benefit obligation, balance	$ 21,101	$ 17,972
Interest cost	879	919	892
Actuarial loss	1,428	3,101
Benefits paid	(877)	(891)
Projected benefit obligation, balance	22,531	21,101	17,972
Change in plan assets:
Market value of assets, balance	15,421	13,027
Actual return on plan assets	2,033	551
Employer contributions	723	2,734
Benefits paid	(877)	(891)
Market value of assets, balance	17,300	15,421	13,027
Accrued pension cost included in other liabilities	$ (5,231)	$ (5,680)