Note 5 - Investment Securities Available For Sale (Detail) - Amortized Cost and Fair Values of Securities Available for Sale (USD $)	Jun. 30, 2012	Dec. 31, 2011
Available for Sale Securities Amortized Cost	$ 165,038,000	$ 187,097,000
Available for Sale Securities Gross Unrealized Gains	8,498,000	7,104,000
Available for Sale Securities Gross Unrealized Losses	(90,000)	(224,000)
Available for Sale Securities Fair Value	173,446,000	193,977,000
Taxable [Member] \| US States and Political Subdivisions Debt Securities [Member]
Available for Sale Securities Amortized Cost	8,201,000	8,207,000
Available for Sale Securities Gross Unrealized Gains	956,000	766,000
Available for Sale Securities Fair Value	9,157,000	8,973,000
Tax-exempt [Member] \| US States and Political Subdivisions Debt Securities [Member]
Available for Sale Securities Amortized Cost	74,842,000	75,807,000
Available for Sale Securities Gross Unrealized Gains	4,611,000	3,681,000
Available for Sale Securities Gross Unrealized Losses	(23,000)	(61,000)
Available for Sale Securities Fair Value	79,430,000	79,427,000
US Government Agencies Debt Securities [Member]
Available for Sale Securities Amortized Cost	12,989,000	31,520,000
Available for Sale Securities Gross Unrealized Gains	583,000	427,000
Available for Sale Securities Gross Unrealized Losses		(14,000)
Available for Sale Securities Fair Value	13,572,000	31,933,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available for Sale Securities Amortized Cost	62,437,000	63,808,000
Available for Sale Securities Gross Unrealized Gains	1,863,000	1,819,000
Available for Sale Securities Gross Unrealized Losses	(26,000)	(54,000)
Available for Sale Securities Fair Value	64,274,000	65,573,000
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Available for Sale Securities Amortized Cost	5,819,000	7,005,000
Available for Sale Securities Gross Unrealized Gains	484,000	411,000
Available for Sale Securities Gross Unrealized Losses	(41,000)	(95,000)
Available for Sale Securities Fair Value	6,262,000	7,321,000
Debt Securities [Member]
Available for Sale Securities Amortized Cost	164,288,000	186,347,000
Available for Sale Securities Gross Unrealized Gains	8,497,000	7,104,000
Available for Sale Securities Gross Unrealized Losses	(90,000)	(224,000)
Available for Sale Securities Fair Value	172,695,000	193,227,000
Equity Securities in Financial Institutions [Member]
Available for Sale Securities Amortized Cost	750,000	750,000
Available for Sale Securities Gross Unrealized Gains	1,000
Available for Sale Securities Fair Value	$ 751,000	$ 750,000

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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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+ Details

- Definition

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.

+ References+ Details

- 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.

+ References+ Details