Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - Amounts in accumulated other comprehensive income to be recognized as components of net periodic expense for these plans in 2012: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Net Actuarial loss (gain)	$ 1,236
Prior Service cost (credit)	(45)
Total	1,191
Retirement Plan [Member]
Net Actuarial loss (gain)	1,222
Total	1,222
Other Postretirement Benefit Plans [Member]
Net Actuarial loss (gain)	50
Prior Service cost (credit)	(85)
Total	(35)
Directors' Plan [Member]
Net Actuarial loss (gain)	(36)
Prior Service cost (credit)	40
Total	$ 4