Note 18 - Other Comprehensive Income (Detail) - Components of other comprehensive income (loss) and other related tax effects (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net unrealized gains (losses) arising during the year, before tax	$ 5,557	$ 19,282	$ (6,197)
Net unrealized gains (losses) arising during the year, tax effect	(2,337)	(8,108)	2,606
Net unrealized gains (losses) arising during the year, net of tax	3,220	11,174	(3,591)
Net unrealized gains (losses) arising during the year, before tax	5,557	19,282	(6,197)
Net unrealized gains (losses) arising during the year, tax effect	(2,337)	(8,108)	2,606
Net unrealized gains (losses) arising during the year, net of tax	3,220	11,174	(3,591)
Post-retirement benefit obligation, before tax	61	61	61
Post-retirement benefit obligation, tax effect	(25)	(25)	(25)
Post-retirement benefit obligation, net of tax	36	36	36
Other comprehensive income (loss), before tax	5,618	19,343	(6,136)
Other comprehensive income (loss), tax effect	(2,362)	(8,133)	2,581
Other comprehensive income (loss), net of tax	$ 3,256	$ 11,210	$ (3,555)