Note 13 - Accumulated Other Comprehensive Income (Detail) - Changes in accumulated other comprehensive income by component: (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Beginning balance, net of tax	$ 12,137
Other comprehensive income before reclassifications, net of tax	(2,594)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1,441)
Net current period other comprehensive income, net of tax	(4,035)
Ending balance, net of tax	8,102
Unrealized Gains and Losses on Available for Sale Securities [Member]
Beginning balance, net of tax	18,921
Other comprehensive income before reclassifications, net of tax	(2,594)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1,609)
Net current period other comprehensive income, net of tax	(4,203)
Ending balance, net of tax	14,718
Defined Benefit Pension Items [Member]
Beginning balance, net of tax	(6,784)
Amounts reclassified from accumulated other comprehensive income, net of tax	168
Net current period other comprehensive income, net of tax	168
Ending balance, net of tax	$ (6,616)