Note 4 - Fair Value (Detail) - Assets Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Securities Available For Sale	$ 360,936	$ 353,678
Trading equity securities	6	6
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities Available For Sale	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities Available For Sale	100,076	106,885
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities Available For Sale	0	0
US Government Agencies Debt Securities [Member]
Securities Available For Sale	100,076	106,885
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities Available For Sale	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities Available For Sale	129,327	97,525
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities Available For Sale	20,281	20,289
US States and Political Subdivisions Debt Securities [Member]
Securities Available For Sale	149,608	117,814
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities Available For Sale	0	0
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities Available For Sale	60,706	66,277
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities Available For Sale	0	0
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Securities Available For Sale	60,706	66,277
Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities Available For Sale	0	0
Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities Available For Sale	48,695	61,030
Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities Available For Sale	0	0
Collateralized Mortgage Obligations [Member]
Securities Available For Sale	48,695	61,030
Equity Securities, Other [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities Available For Sale	97	91
Equity Securities, Other [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities Available For Sale	0	0
Equity Securities, Other [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities Available For Sale	1,754	1,581
Equity Securities, Other [Member]
Securities Available For Sale	1,851	1,672
Fair Value, Inputs, Level 1 [Member]
Securities Available For Sale	97	91
Trading equity securities	6	6
Fair Value, Inputs, Level 2 [Member]
Securities Available For Sale	338,804	331,717
Trading equity securities	0	0
Fair Value, Inputs, Level 3 [Member]
Securities Available For Sale	22,035	21,870
Trading equity securities	$ 0	$ 0

- Definition

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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