Note 14 - Financial Instruments with Off-Balance Sheet Risk - Financial Instruments Outstanding Representing Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commitments to Extend Credit [Member]
Off balance sheet liability, amount	$ 130,252	$ 125,934
Standby Letters of Credit 1 [Member]
Off balance sheet liability, amount	20,499	15,248
Interest Rate Lock Commitments [Member]
Off balance sheet liability, amount	$ 17,526	$ 17,571