Note 7 - Investment Securities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Note 7 - Investment Securities (Details) [Line Items]
Proceeds from Sale of Available-for-sale Securities			$ 13,552,000	$ 22,395,000
Available-for-sale Securities Pledged as Collateral	219,825,000		219,825,000		170,433,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(102,000)	13,000	(278,000)	(167,000)
Available-for-sale Securities, Amortized Cost Basis	410,244,000		410,244,000		394,750,000
Available-for-sale (amortized cost $410,244 and $394,750)	407,248,000		407,248,000		401,502,000
Threshold for Identifying Banks with Trust Preferred Securities (in Dollars)			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%
Pooled Trust Preferred Securities [Member]
Note 7 - Investment Securities (Details) [Line Items]
Available-for-sale Securities, Amortized Cost Basis	3,519,000		3,519,000		3,519,000
Available-for-sale (amortized cost $410,244 and $394,750)	$ 2,169,000		$ 2,169,000		$ 1,962,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	5		5
Pooled Trust Preferred Securities [Member] | Minimum [Member]
Note 7 - Investment Securities (Details) [Line Items]
Fair Value Inputs, Loss Severity			0.00%
Pooled Trust Preferred Securities [Member] | Maximum [Member]
Note 7 - Investment Securities (Details) [Line Items]
Fair Value Inputs, Loss Severity			100.00%