Note 7 - Other Assets - Summary of Major Components of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash surrender value of life insurance other than BOLI	$ 16,213	$ 13,543
Net deferred tax asset	9,206	12,896
Investments in tax credit related ventures	3,216	5,244
Other real estate owned and other foreclosed property	2,640	5,033
Other short term receivables	2,215	2,100
Core deposit intangible	1,225	1,405
Mortgage servicing rights (MSRs)	875	921	$ 1,018
Goodwill	682	682
Other	12,234	7,553
Total	$ 48,506	$ 49,377