Note 21 - Quarterly Financial Data (Unaudited) (Details Textual) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 5,900			$ 5,869
Gain on Extinguishment of Debt				0	4,050
Gain (Loss) on Sale of Securities, Net		$ 3,800
Loss on Extinguishment of Debt		$ 3,800		$ 0	$ 3,776
Subordinated Debt [Member]
Gain on Extinguishment of Debt			$ 4,100