Note 7 - Bank Premises and Equipment, Net (Details) - Bank Premises and Equipment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 48,465	$ 44,234
Less: Accumulated depreciation and amortization	26,597	23,878
Bank premises and equipment, net	21,868	20,356
Land [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	3,551	3,551
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	25,717	22,464
Equipment and furniture [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, gross	$ 19,197	$ 18,219