Note 8 - Long-term Borrowings - Summary of Long-term Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Less: debt issurance costs	$ (3,388)	$ (3,486)	$ (1,042)
Long-term borrowings	216,612	216,514	68,958
Subordinated Notes, 5.75% [Member]
Subordinated notes	70,000	70,000	70,000
Subordinated Notes, 5.0% [Member]
Subordinated notes	$ 150,000	$ 150,000