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Note 15 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment securities available-for-sale, at fair value	$ 158,425	$ 181,910
Fair Value, Measurements, Recurring [Member] | Other Assets [Member]
Other assets - derivatives	291	346
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Assets [Member]
Other assets - derivatives
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Assets [Member]
Other assets - derivatives	291	346
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Assets [Member]
Other assets - derivatives
Residential Mortgage Backed Securities [Member]
Investment securities available-for-sale, at fair value	83,550	98,409
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available-for-sale, at fair value	83,550	98,409
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale, at fair value
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale, at fair value	83,550	98,409
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale, at fair value
Commercial Mortgage Backed Securities [Member]
Investment securities available-for-sale, at fair value	67,138	70,530
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available-for-sale, at fair value	67,138	70,530
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale, at fair value
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale, at fair value	67,138	70,530
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale, at fair value
US States and Political Subdivisions Debt Securities [Member]
Investment securities available-for-sale, at fair value	5,655	10,142
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available-for-sale, at fair value	5,655	10,142
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale, at fair value
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale, at fair value	5,655	10,142
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale, at fair value
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available-for-sale, at fair value	2,002	1,993
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale, at fair value
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale, at fair value	2,002	1,993
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale, at fair value
US Treasury Securities [Member]
Investment securities available-for-sale, at fair value	80	80
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available-for-sale, at fair value	80	80
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale, at fair value
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale, at fair value	80	80
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale, at fair value
Corporate Debt Securities [Member]
Investment securities available-for-sale, at fair value		756
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available-for-sale, at fair value		756
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale, at fair value
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale, at fair value		756
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale, at fair value

X

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Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

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+ References

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