Note 3 - Investment Securities Available for Sale (Details) - Reconciliation of Available for Sale Securities in Continuous Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Note 3 - 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	42	16
Less than 12 months, fair value	$ 145,985	$ 63,002
Less than 12 months, gross unrealized losses	4,037	564
12 months or longer, number of securities	8	9
12 months or longer, fair value	7,595	9,547
12 months or longer, gross unrealized losses	79	46
Number of securities	50	25
Fair value	153,580	72,549
Gross unrealized losses	4,116	610
State and Municipal [Member]
Note 3 - 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	1,012
Less than 12 months, gross unrealized losses	73
Number of securities	1
Fair value	1,012
Gross unrealized losses	73	0
Collateralized Mortgage Obligations (Federal Agencies) [Member]
Note 3 - 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	23
Less than 12 months, fair value	95,167
Less than 12 months, gross unrealized losses	3,494
12 months or longer, number of securities	6
12 months or longer, fair value	2,962
12 months or longer, gross unrealized losses	21
Number of securities	29
Fair value	98,129
Gross unrealized losses	3,515	155
Other Mortgage-Backed (Federal Agencies) [Member]
Note 3 - 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	16	3
Less than 12 months, fair value	45,276	14,586
Less than 12 months, gross unrealized losses	416	92
12 months or longer, number of securities	1
12 months or longer, fair value	3,363
12 months or longer, gross unrealized losses	46
Number of securities	17	3
Fair value	48,639	14,586
Gross unrealized losses	462	92
SBA Loan-Backed (Federal Agencies) [Member]
Note 3 - 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	2	6
Less than 12 months, fair value	4,530	25,115
Less than 12 months, gross unrealized losses	54	363
12 months or longer, number of securities	1
12 months or longer, fair value	1,270
12 months or longer, gross unrealized losses	12
Number of securities	3	6
Fair value	5,800	25,115
Gross unrealized losses	66	363
Collateralized Mortgage Backed Securities [Member]
Note 3 - 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		7
Less than 12 months, fair value		23,301
Less than 12 months, gross unrealized losses		109
12 months or longer, number of securities		9
12 months or longer, fair value		9,547
12 months or longer, gross unrealized losses		46
Number of securities		16
Fair value		32,848
Gross unrealized losses		$ 155