Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Mortgage Loans Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Aggregate Unpaid Principal Balance	$ 20,071	$ 42,046
Excess Carrying Amount Over Aggregate Unpaid Principle Balance	816	1,329
Reported Value Measurement [Member]
Carrying Amount	$ 20,887	$ 43,375