Note 7 - Investment Securities (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Pooled Trust Preferred Securities [Member] Minimum [Member]	Sep. 30, 2014 Pooled Trust Preferred Securities [Member] Maximum [Member]	Sep. 30, 2014 Pooled Trust Preferred Securities [Member]	Dec. 31, 2013 Pooled Trust Preferred Securities [Member]	Jun. 30, 2013 Equity Securities [Member]	Sep. 30, 2014 Pooled Trust Preferred Securities [Member]	Sep. 30, 2014 Pooled Trust Preferred Securities [Member]
Note 7 - Investment Securities (Details) [Line Items]
Trading Securities, Change in Unrealized Holding Gain (Loss)			$ 27,000
Trading Securities	4,122,000		4,122,000		0
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds			19,504,000	13,552,000
Available-for-sale Securities Pledged as Collateral	241,559,000		241,559,000		207,868,000
Income Tax Benefit Related To Net Realized Gains Losses On Sales Of Securities	61,000	103,000	370,000	278,000
Other than Temporary Impairment Losses, Investments			0	(43,000)				1,271,000		43,000	0	0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Default Rate										20.00%
Proceeds from Sale of Held-to-maturity Securities	0	0	0	0
Number of Trust Preferred Securities	7		7
Available-for-sale Securities, Amortized Cost Basis	362,906,000		362,906,000		393,840,000			3,519,000	3,519,000
Available-for-sale Securities	362,468,000		362,468,000		388,670,000			2,462,000	2,069,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year								5
Fair Value Inputs, Prepayment Rate			1.00%
Threshold for Identifying Banks with Trust Preferred Securities			$ 15,000,000,000
Minimum Cost Saving for Refinance	2.00%		2.00%
Bank Failure Rate			0.36%
Fair Value Inputs, Loss Severity			95.00%			0.00%	100.00%