Note 2 - Securities (Details) - Gross Unrealized Losses And Fair Value Of Securities Available For Sale Gross Of OTTI (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Securities available-for-sale
Less Than 12 Months Fair Value Available-for-sale	$ 144,984,000	$ 9,921,000
Less Than 12 Months Gross Unrealized Losses Available-for-sale	(6,891,000)	(73,000)
Greater Than 12 Months Fair Value Available-for-sale	0	72,000
Greater Than 12 Months Gross Unrealized Losses Available-for-sale	0	0
Total Fair Value Available-for-sale	144,984,000	9,993,000
Total Gross Unrealized Losses Available-for-sale	(6,891,000)	(73,000)
Less Than 12 Months Fair Value Held-to-maturity	2,158,000
Less Than 12 Months Gross Unrealized Losses Held-to-maturity	(52,000)
Greater Than 12 Months Fair Value Held-to-maturity	0
Greater Than 12 Months Gross Unrealized Losses Held-to-maturity	0
Total Fair Value Held-to-maturity	2,158,000
Total Gross Unrealized Losses Held-to-maturity	(52,000)
US Treasury and Government [Member]
Securities available-for-sale
Less Than 12 Months Fair Value Available-for-sale	81,747,000	9,921,000
Less Than 12 Months Gross Unrealized Losses Available-for-sale	(4,649,000)	(73,000)
Greater Than 12 Months Fair Value Available-for-sale	0	0
Greater Than 12 Months Gross Unrealized Losses Available-for-sale	0	0
Total Fair Value Available-for-sale	81,747,000	9,921,000
Total Gross Unrealized Losses Available-for-sale	(4,649,000)	(73,000)
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale
Less Than 12 Months Fair Value Available-for-sale	14,161,000
Less Than 12 Months Gross Unrealized Losses Available-for-sale	(912,000)
Greater Than 12 Months Fair Value Available-for-sale	0
Greater Than 12 Months Gross Unrealized Losses Available-for-sale	0
Total Fair Value Available-for-sale	14,161,000
Total Gross Unrealized Losses Available-for-sale	(912,000)
Less Than 12 Months Fair Value Held-to-maturity	2,158,000
Less Than 12 Months Gross Unrealized Losses Held-to-maturity	(52,000)
Greater Than 12 Months Fair Value Held-to-maturity	0
Greater Than 12 Months Gross Unrealized Losses Held-to-maturity	0
Total Fair Value Held-to-maturity	2,158,000
Total Gross Unrealized Losses Held-to-maturity	(52,000)
US Government Agencies Debt Securities [Member]
Securities available-for-sale
Less Than 12 Months Fair Value Available-for-sale	35,108,000
Less Than 12 Months Gross Unrealized Losses Available-for-sale	(929,000)
Greater Than 12 Months Fair Value Available-for-sale	0
Greater Than 12 Months Gross Unrealized Losses Available-for-sale	0
Total Fair Value Available-for-sale	35,108,000
Total Gross Unrealized Losses Available-for-sale	(929,000)
Residential Mortgage Backed Securities [Member]
Securities available-for-sale
Less Than 12 Months Fair Value Available-for-sale	17,000	0
Less Than 12 Months Gross Unrealized Losses Available-for-sale	0	0
Greater Than 12 Months Fair Value Available-for-sale	0	72,000
Greater Than 12 Months Gross Unrealized Losses Available-for-sale	0	0
Total Fair Value Available-for-sale	17,000	72,000
Total Gross Unrealized Losses Available-for-sale	0	0
CRA Funds [Member]
Securities available-for-sale
Less Than 12 Months Fair Value Available-for-sale	13,951,000
Less Than 12 Months Gross Unrealized Losses Available-for-sale	(401,000)
Total Fair Value Available-for-sale	13,951,000
Total Gross Unrealized Losses Available-for-sale	$ (401,000)