Note 17 - Fair Value of Financial Instruments - Balances of Impaired Loans and OREO Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
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	1,690	2,350
Impaired Loans [Member]
Financial assets measured at fair value	1,690	2,350
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	5,391	6,038
OREO [Member]
Financial assets measured at fair value	5,391	$ 6,038
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	73
Other Assets [Member]
Financial assets measured at fair value	$ 73