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	Jun. 30, 2018	Dec. 31, 2017
Impaired loans	$ 14,102	$ 16,027
Other Repossessed Assets	35
Total assets	14,137	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	14,102	16,027
Other Repossessed Assets	35
Total assets	$ 14,137	$ 16,027