Note 18 - Intangible Assets and Goodwill - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Intangible assets, gross carrying value	$ 22,105	$ 22,105
Intangible assets, accumulated amortization	16,207	16,139
Intangible assets, net carrying value	5,898	5,966
Unamortizable goodwill, gross carrying value	5,848	5,848
Unamortizable goodwill, net carrying value	5,848	5,848
Core Deposits [Member]
Intangible assets, gross carrying value	16,257	16,257
Intangible assets, accumulated amortization	16,207	16,139
Intangible assets, net carrying value	$ 50	$ 118