Note 7 - Fair Value of Financial Instruments (Details) - Fair Values of Financial Instruments - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Financial assets:
Cash and cash equivalents	$ 65,198	$ 27,139
Cash and cash equivalents, at fair value	65,198	27,139
Investment securities available for sale	260,269	284,795
Investment securities available for sale, at fair value	260,269	284,795
Investment securities held to maturity	178,628	172,277
Investment securities held to maturity, at fair value	181,306	171,845
Restricted stock, at cost	1,179	3,059
Restricted stock, at fair value	1,179	3,059
Loans held for sale	1,983	3,653
Loans held for sale, at fair value	1,999	3,831
Loans receivable, net	890,088	866,066
Loans receivable, net, at fair value	870,274	849,578
SBA servicing assets	5,058	4,886
SBA servicing assets, at fair value	5,058	4,886	$ 4,267	$ 4,099
Accrued interest receivable	4,434	4,216
Accrued interest receivable, at fair value	4,434	4,216
Deposits
Demand, savings and money market	1,277,199	1,181,720
Demand, savings and money market, at fair value	1,277,199	1,181,720
Time deposits	60,408	67,578
Time deposits, at fair value	60,340	67,422
Subordinated debt	22,476	22,476
Subordinated debt	19,186	18,972
Accrued interest payable	219	245
Accrued interest payable, at fair value	219	245
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
Deposits
Short-term borrowings		47,000
Short-term borrowings		47,000
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents, at fair value	65,198	27,139
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	255,567	280,078
Investment securities available for sale, at fair value	255,567	280,078
Investment securities held to maturity, at fair value	181,306	171,845
Restricted stock, at fair value	1,179	3,059
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	4,434	4,216
Deposits
Demand, savings and money market, at fair value	1,277,199	1,181,720
Time deposits, at fair value	60,340	67,422
Subordinated debt	0	0
Accrued interest payable, at fair value	219	245
Deposits
Short-term borrowings		47,000
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents, at fair value	0	0
Investment securities available for sale	4,702	4,717
Investment securities available for sale, at fair value	4,702	4,717
Investment securities held to maturity, at fair value	0	0
Restricted stock, at fair value	0	0
Loans held for sale, at fair value	1,999	3,831
Loans receivable, net, at fair value	870,274	849,578
SBA servicing assets, at fair value	5,058	4,886
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	19,186	18,972
Accrued interest payable, at fair value	$ 0	0
Deposits
Short-term borrowings		$ 0