Note 3 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Due in one year or less	$ 4,000
Due in one year or less	3,999
Due in one year or less	271
Due in one year or less	272
Due in over one to five years	6,621
Due in over one to five years	6,576
Due in over one to five years	6,850
Due in over one to five years	7,109
Due in over five to ten years
Due in over five to ten years
Due in over five to ten years	8,442
Due in over five to ten years	8,815
Due after ten years
Due after ten years
Due after ten years	3,259
Due after ten years	3,175
Agency mortgage-backed securities, residential	93,358
Agency mortgage-backed securities, residential	92,597
Agency mortgage-backed securities, residential	5
Agency mortgage-backed securities, residential	5
Total debt securities	103,979
Total debt securities	103,172
Total debt securities	18,827	$ 18,665
Securities held to maturity	$ 19,376	$ 19,171

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

Name:	us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant