Note 3 - Investment Securities (Detail) - Amortized Cost and Approximate Fair Values of Investment Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Available for sale securites - amortized cost	$ 141,735	$ 126,021	$ 126,639
Available for sale securities - unrealized gains	1,656	1,994	2,018
Available for sale securities - unrealized losses	(473)	(193)	(35)
Available for sale securities - fair value	142,918	127,822	128,622
US Government Agencies Debt Securities [Member]
Available for sale securites - amortized cost	21,643	30,007	26,650
Available for sale securities - unrealized gains	567	589	360
Available for sale securities - unrealized losses	(61)	(7)	(12)
Available for sale securities - fair value	22,149	30,589	26,998
Residential Mortgage Backed Securities [Member]
Available for sale securites - amortized cost	79,686	60,550	85,474
Available for sale securities - unrealized gains	851	1,159	1,404
Available for sale securities - unrealized losses	(309)	(49)
Available for sale securities - fair value	80,228	61,660	86,878
US States and Political Subdivisions Debt Securities [Member]
Available for sale securites - amortized cost	19,377	19,247	4,596
Available for sale securities - unrealized gains	138	132	219
Available for sale securities - unrealized losses	(66)	(106)	(2)
Available for sale securities - fair value	19,449	19,273	4,813
Corporate Debt Securities [Member]
Available for sale securites - amortized cost	4,254	3,015	3,048
Available for sale securities - unrealized gains	18	2	3
Available for sale securities - unrealized losses		(21)	(12)
Available for sale securities - fair value	4,272	2,996	3,039
Asset-backed Securities [Member]
Available for sale securites - amortized cost	16,775	13,202	6,871
Available for sale securities - unrealized gains	82	112	32
Available for sale securities - unrealized losses	(37)	(10)	(9)
Available for sale securities - fair value	$ 16,820	$ 13,304	$ 6,894

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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