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	Sep. 30, 2014	Dec. 31, 2013
Note 4 - Investment Securities Available-for-sale (Details) - Reconciliation of Available-for-sale Securities in Continuous Unrealized Loss Position [Line Items]
Investment securities available for sale in an unrealized loss position less than 12 months, number of securities	21	39
Investment securities available for sale in an unrealized loss position less than 12 months, fair value	$ 38,118	$ 142,157
Investment securities available for sale in an unrealized loss position less than 12 months, gross unrealized losses	420	3,781
Investment securities available for sale in an unrealized loss position 12 months or longer, number of securities	29	13
Investment securities available for sale in an unrealized loss position 12 months or longer, fair value	103,558	35,946
Investment securities available for sale in an unrealized loss position 12 months or longer, gross unrealized losses	2,575	1,560
Investment securities available for sale in an unrealized loss position, number of securities	50	52
Investment securities available for sale in an unrealized loss position, fair value	141,676	178,103
Investment securities available for sale in an unrealized loss position, gross unrealized losses	2,995	5,341
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]
Investment securities available for sale in an unrealized loss position less than 12 months, number of securities	1	1
Investment securities available for sale in an unrealized loss position less than 12 months, fair value	575	1,010
Investment securities available for sale in an unrealized loss position less than 12 months, gross unrealized losses	3	71
Investment securities available for sale in an unrealized loss position 12 months or longer, number of securities	1
Investment securities available for sale in an unrealized loss position 12 months or longer, fair value	1,056
Investment securities available for sale in an unrealized loss position 12 months or longer, gross unrealized losses	19
Investment securities available for sale in an unrealized loss position, number of securities	2	1
Investment securities available for sale in an unrealized loss position, fair value	1,631	1,010
Investment securities available for sale in an unrealized loss position, gross unrealized losses	22	71
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]
Investment securities available for sale in an unrealized loss position less than 12 months, number of securities	7	14
Investment securities available for sale in an unrealized loss position less than 12 months, fair value	21,907	62,251
Investment securities available for sale in an unrealized loss position less than 12 months, gross unrealized losses	318	2,863
Investment securities available for sale in an unrealized loss position 12 months or longer, number of securities	11	9
Investment securities available for sale in an unrealized loss position 12 months or longer, fair value	62,896	29,123
Investment securities available for sale in an unrealized loss position 12 months or longer, gross unrealized losses	2,098	1,338
Investment securities available for sale in an unrealized loss position, number of securities	18	23
Investment securities available for sale in an unrealized loss position, fair value	84,803	91,374
Investment securities available for sale in an unrealized loss position, gross unrealized losses	2,416	4,201
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]
Investment securities available for sale in an unrealized loss position less than 12 months, number of securities	11	20
Investment securities available for sale in an unrealized loss position less than 12 months, fair value	13,424	64,428
Investment securities available for sale in an unrealized loss position less than 12 months, gross unrealized losses	88	774
Investment securities available for sale in an unrealized loss position 12 months or longer, number of securities	11	1
Investment securities available for sale in an unrealized loss position 12 months or longer, fair value	23,734	1,517
Investment securities available for sale in an unrealized loss position 12 months or longer, gross unrealized losses	354	153
Investment securities available for sale in an unrealized loss position, number of securities	22	21
Investment securities available for sale in an unrealized loss position, fair value	37,158	65,945
Investment securities available for sale in an unrealized loss position, gross unrealized losses	442	927
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]
Investment securities available for sale in an unrealized loss position less than 12 months, number of securities	2	4
Investment securities available for sale in an unrealized loss position less than 12 months, fair value	2,212	14,468
Investment securities available for sale in an unrealized loss position less than 12 months, gross unrealized losses	11	73
Investment securities available for sale in an unrealized loss position 12 months or longer, number of securities	6	3
Investment securities available for sale in an unrealized loss position 12 months or longer, fair value	15,872	5,306
Investment securities available for sale in an unrealized loss position 12 months or longer, gross unrealized losses	104	69
Investment securities available for sale in an unrealized loss position, number of securities	8	7
Investment securities available for sale in an unrealized loss position, fair value	18,084	19,774
Investment securities available for sale in an unrealized loss position, gross unrealized losses	$ 115	$ 142