Note 18 - Parent Company Financial Information (Details) - Condensed Balance Sheet (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 18,245,000	$ 16,286,000	$ 15,453,000
Investment securities available-for-sale	375,219,000us-gaap_AvailableForSaleSecurities	388,670,000us-gaap_AvailableForSaleSecurities
Other assets	8,082,000us-gaap_OtherAssets	10,365,000us-gaap_OtherAssets
Total assets	977,135,000us-gaap_Assets	932,883,000us-gaap_Assets
Other liabilities	3,656,000us-gaap_OtherLiabilities	2,178,000us-gaap_OtherLiabilities
Shareholders' equity	86,354,000us-gaap_StockholdersEquity	75,625,000us-gaap_StockholdersEquity	77,623,000us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	977,135,000	932,883,000
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	48,000	24,000	102,000
Investment securities available-for-sale	7,655,000	6,625,000
Investment in subsidiary	79,112,000	69,215,000
Other assets	3,000	15,000
Total assets	86,818,000	75,879,000
Other liabilities	464,000	254,000
Shareholders' equity	86,354,000	75,625,000
Total liabilities and shareholders' equity	$ 86,818,000	$ 75,879,000

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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