Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	$ 260,269	$ 284,795
SBA Servicing Assets	5,058	4,886	$ 4,267	$ 4,099
Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	260,269	284,795
SBA Servicing Assets	5,058	4,886
Collateralized Mortgage Obligations [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	155,097	178,145
Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	155,097	178,145
Collateralized Mortgage Backed Securities [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	9,962	10,171
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	9,962	10,171
US States and Political Subdivisions Debt Securities [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	23,658	23,344
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	23,658	23,344
Corporate Debt Securities [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	52,778	54,129
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	52,778	54,129
Asset-backed Securities [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	16,799	17,005
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	16,799	17,005
Collateralized Debt Obligations [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	1,858	1,883
Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	1,858	1,883
Other Debt Obligations [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	117	118
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	117	118
Fair Value, Inputs, Level 1 [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
SBA Servicing Assets	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	255,567	280,078
SBA Servicing Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	255,567	280,078
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	155,097	178,145
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	9,962	10,171
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	23,658	23,344
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	49,934	51,295
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	16,799	17,005
Fair Value, Inputs, Level 2 [Member] | Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	117	118
Fair Value, Inputs, Level 3 [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	4,702	4,717
SBA Servicing Assets	5,058	4,886
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	4,702	4,717
SBA Servicing Assets	5,058	4,886
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	2,844	2,834
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	1,858	1,883
Fair Value, Inputs, Level 3 [Member] | Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Note 7 - Fair Value of Financial Instruments (Details) - Financial Assets Measured at on a Recurring Basis [Line Items]
Investment securities available for sale, at fair value	$ 0	$ 0