Note 15 - Fair Value of Financial Instruments - Balances of Impaired Loans and OREO Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Assets [Member]
Financial assets measured at fair value	$ 280	$ 280
Fair Value, Inputs, Level 1 [Member] | Other Assets [Member]
Financial assets measured at fair value
Fair Value, Inputs, Level 2 [Member] | Other Assets [Member]
Financial assets measured at fair value
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member]
Financial assets measured at fair value	280	280
Impaired Loans [Member]
Financial assets measured at fair value	1,535	1,568
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets measured at fair value
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets measured at fair value
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets measured at fair value	1,535	1,568
OREO [Member]
Financial assets measured at fair value	4,351	4,858
OREO [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets measured at fair value
OREO [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets measured at fair value
OREO [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets measured at fair value	$ 4,351	$ 4,858