Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Mortgage Loans Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Aggregate Unpaid Principal Balance	$ 9,983	$ 20,071
Excess Carrying Amount Over Aggregate Unpaid Principle Balance	362	816
Reported Value Measurement [Member]
Carrying Amount	$ 10,345	$ 20,887