Note 5 - Stockholders' Equity and Earnings Per Common Share (Detail) - Components of other Comprehensive income, net of deferred tax assets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Net unrealized gains on securities	$ 5,414	$ 5,951	$ 4,721	$ 4,596
Net unrecognized loss on cash flow hedges	(283)	(313)	(311)	(314)
Net unrecognized losses on defined benefit pension plan	(913)	(922)	(891)	(898)
Total cumulative other comprehensive income	$ 4,218	$ 4,716	$ 3,519	$ 3,384