Note 15 - Fair Value Measurements and Fair Values of Financial Instruments (Details) - Fair Values of Financial Instruments - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial assets:
Cash and cash equivalents	$ 27,139	$ 128,826
Cash and cash equivalents, at fair value	27,139	128,826
Investment securities available for sale	284,795	185,379
Investment securities available for sale, at fair value	284,795	185,379
Investment securities held to maturity	172,277	67,866
Investment securities held to maturity, at fair value	171,845	68,253
Restricted stock, at cost	3,059	1,157
Restricted stock, at fair value	3,059	1,157
Loans held for sale	3,653	1,676
Loans held for sale, at fair value	3,831	1,699
Loans receivable, net	866,066	770,404
Loans receivable, net, at fair value	849,578	760,163
SBA servicing assets	4,886	4,099
SBA servicing assets, at fair value	4,886	4,099	$ 3,477	$ 2,340
Accrued interest receivable	4,216	3,226
Accrued interest receivable, at fair value	4,216	3,226
Deposits
Demand, savings and money market	1,181,720	996,861
Demand, savings and money market, at fair value	1,181,720	996,861
Time deposits	67,578	75,369
Time deposits, at fair value	67,422	75,592
Short-term borrowings	47,000
Short-term borrowings	47,000
Subordinated debt	22,476	22,476
Subordinated debt	18,972	18,221
Accrued interest payable	245	265
Accrued interest payable, at fair value	245	265
Off-Balance Sheet Data
Commitments to extend credit	0	0
Commitments to extend credit, at fair value	0	0
Standby letters-of-credit	0	0
Standby letters-of-credit, at fair value	0	0
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents, at fair value	27,139	128,826
Investment securities available for sale	0	0
Investment securities available for sale, at fair value	0	0
Investment securities held to maturity, at fair value	0	0
Restricted stock, at fair value	0	0
Loans held for sale, at fair value	0	0
Loans receivable, net, at fair value	0	0
SBA servicing assets, at fair value	0	0
Accrued interest receivable, at fair value	0	0
Deposits
Demand, savings and money market, at fair value	0	0
Time deposits, at fair value	0	0
Subordinated debt	0	0
Accrued interest payable, at fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Cash and cash equivalents, at fair value	0	0
Investment securities available for sale	280,078	179,181
Investment securities available for sale, at fair value	280,078	179,181
Investment securities held to maturity, at fair value	171,845	68,253
Restricted stock, at fair value	3,059	1,157
Loans held for sale, at fair value	0	0
Loans receivable, net, at fair value	0	0
SBA servicing assets, at fair value	0	0
Accrued interest receivable, at fair value	4,216	3,226
Deposits
Demand, savings and money market, at fair value	1,181,720	996,861
Time deposits, at fair value	67,422	75,592
Short-term borrowings	47,000
Subordinated debt	0	0
Accrued interest payable, at fair value	245	265
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents, at fair value	0	0
Investment securities available for sale	4,717	6,198
Investment securities available for sale, at fair value	4,717	6,198
Investment securities held to maturity, at fair value	0	0
Restricted stock, at fair value	0	0
Loans held for sale, at fair value	3,831	1,699
Loans receivable, net, at fair value	849,578	760,163
SBA servicing assets, at fair value	4,886	4,099
Accrued interest receivable, at fair value	0	0
Deposits
Demand, savings and money market, at fair value	0	0
Time deposits, at fair value	0	0
Short-term borrowings	0
Subordinated debt	18,972	18,221
Accrued interest payable, at fair value	$ 0	$ 0