Note 10 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, and the Method Used to Determine Their Fair Value (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Impaired loans	$ 12,798	$ 16,027
Other Repossessed Assets	35
Total assets	12,833	16,027
Fair Value, Inputs, Level 1 [Member]
Impaired loans
Other Repossessed Assets
Total assets
Fair Value, Inputs, Level 2 [Member]
Impaired loans
Other Repossessed Assets
Total assets
Fair Value, Inputs, Level 3 [Member]
Impaired loans	12,798	16,027
Other Repossessed Assets	35
Total assets	$ 12,833	$ 16,027