Note 3 - Securities (Detail) - Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Amortized Cost	$ 23,496	$ 23,511
Gross Unrecognized Gains	1,098	1,178
Gross Unrecognized Losses	(74)	(65)
Estimated Fair Value	24,520	24,624
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	23,481	23,494
Gross Unrecognized Gains	1,098	1,178
Gross Unrecognized Losses	(74)	(65)
Estimated Fair Value	24,505	24,607
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized Cost	15	17
Estimated Fair Value	$ 15	$ 17

This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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