Note 7 - Fair Value of Financial Instruments - Mortgage Loans Held for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Aggregate Unpaid Principal Balance	$ 34,802	$ 42,046
Excess Carrying Amount Over Aggregate Unpaid Principle Balance	1,288	1,329
Reported Value Measurement [Member]
Carrying Amount	$ 36,090	$ 43,375