Note 4 - Loans Held for Sale (Details Textual) - Performing Financial Instruments [Member] $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Small Business Administration Portfolio Segment [Member]
Number of Loans Held for Sale	6	5
Proceeds from Sale of Loans Held-for-sale	$ 3.5	$ 4.2
Gain (Loss) on Sale of Loans and Leases	$ 0.3
Commercial Real Estate Portfolio Segment [Member]
Number of Loans Held for Sale		1
Proceeds from Sale of Loans Held-for-sale		$ 3.1
Commercial Real Estate Portfolio Segment and SBA Loans [Member]
Gain (Loss) on Sale of Loans and Leases		$ 0.3

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Name:	us-gaap_GainLossOnSaleOfLoansAndLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration