Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Disclosure of Mortgage Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans held for sale, at fair value	$ 43,375	$ 23,911
Aggregate Unpaid Principal Balance	42,046	23,428
Excess Carrying Amount Over Aggregate Unpaid Principle Balance	1,329	483
Reported Value Measurement [Member]
Loans held for sale, at fair value	$ 43,375	$ 23,911