Note 5 - Stockholders' Equity and Earnings Per Common Share (Detail) - Change in Components of other Comprehensive Income on a pre-tax and after-tax basis (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined benefit pension plan:
Net loss	$ 30	$ 26
Net loss	10	8
Net loss	20	18
Amortization of prior service costs	(17)	(17)
Amortization of prior service costs	(6)	(6)
Amortization of prior service costs	(11)	(11)
Defined benefit pension plan assets and benefit obligations, net	13	9
Defined benefit pension plan assets and benefit obligations, net	4	2
Defined benefit pension plan assets and benefit obligations, net	9	7
Unrealized loss on cash flow hedging instruments	49	5
Unrealized loss on cash flow hedging instruments	19	2
Unrealized loss on cash flow hedging instruments	30	3
Unrealized holding gains on securities	(827)	193
Unrealized holding gains on securities	(290)	68
Unrealized holding gains on securities	(537)	125
Total increase in other comprehensive income	(765)	207
Total increase in other comprehensive income	(267)	72
Total increase in other comprehensive income	$ (498)	$ 135