Note 4 - Investment Securities Available for Sale (Details) - Reconciliation of Available for Sale Securities in Continuous Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Note 4 - Investment Securities Available for Sale (Details) - Reconciliation of Available for Sale Securities in Continuous Unrealized Loss Position [Line Items]
Less than 12 months, number of securities	46	16
Less than 12 months, fair value	$ 170,969	$ 63,002
Less than 12 months, gross unrealized losses	4,901	564
12 months or longer, number of securities	8	9
12 months or longer, fair value	13,399	9,547
12 months or longer, gross unrealized losses	266	46
Number of securities	54	25
Fair value	184,368	72,549
Gross unrealized losses	5,167	610
State and Municipal [Member]
Note 4 - Investment Securities Available for Sale (Details) - Reconciliation of Available for Sale Securities in Continuous Unrealized Loss Position [Line Items]
Less than 12 months, number of securities	1
Less than 12 months, fair value	1,028
Less than 12 months, gross unrealized losses	56
12 months or longer, number of securities	0
12 months or longer, fair value	0
12 months or longer, gross unrealized losses	0
Number of securities	1
Fair value	1,028
Gross unrealized losses	56	0
Collateralized Mortgage Obligations (Federal Agencies) [Member]
Note 4 - Investment Securities Available for Sale (Details) - Reconciliation of Available for Sale Securities in Continuous Unrealized Loss Position [Line Items]
Less than 12 months, number of securities	19	7
Less than 12 months, fair value	83,057	23,301
Less than 12 months, gross unrealized losses	3,757	109
12 months or longer, number of securities	6	9
12 months or longer, fair value	9,249	9,547
12 months or longer, gross unrealized losses	242	46
Number of securities	25	16
Fair value	92,306	32,848
Gross unrealized losses	3,999	155
Other Mortgage-Backed (Federal Agencies) [Member]
Note 4 - Investment Securities Available for Sale (Details) - Reconciliation of Available for Sale Securities in Continuous Unrealized Loss Position [Line Items]
Less than 12 months, number of securities	21	3
Less than 12 months, fair value	68,798	14,586
Less than 12 months, gross unrealized losses	1,002	92
12 months or longer, number of securities	1	0
12 months or longer, fair value	2,998	0
12 months or longer, gross unrealized losses	6	0
Number of securities	22	3
Fair value	71,796	14,586
Gross unrealized losses	1,008	92
SBA Loan-Backed (Federal Agencies) [Member]
Note 4 - Investment Securities Available for Sale (Details) - Reconciliation of Available for Sale Securities in Continuous Unrealized Loss Position [Line Items]
Less than 12 months, number of securities	5	6
Less than 12 months, fair value	18,086	25,115
Less than 12 months, gross unrealized losses	86	363
12 months or longer, number of securities	1	0
12 months or longer, fair value	1,152	0
12 months or longer, gross unrealized losses	18	0
Number of securities	6	6
Fair value	19,238	25,115
Gross unrealized losses	$ 104	$ 363