Note 7 - Loans and Allowance for Loan Losses - Activity In the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Recoveries	$ 423	$ 80	$ 500	$ 200
Loans charged off	(209)	(267)	(703)	(401)
Balance, end of period	9,222	9,485	9,222	9,485
Balance, beginning of period	9,507	9,828	9,344	10,315
Provision for loan losses	(499)	(156)	81	(629)
Real Estate Portfolio Segment [Member]
Recoveries	398	50	415	102
Loans charged off	(75)	(208)	(509)	(271)
Balance, end of period	7,961	8,404	7,961	8,404
Balance, beginning of period	8,184	8,709	8,205	9,173
Provision for loan losses	(546)	(147)	(150)	(600)
Commercial Portfolio Segment [Member]
Recoveries	17	19	66	55
Loans charged off	(116)	(48)	(148)	(59)
Balance, end of period	900	806	900	806
Balance, beginning of period	864	839	854	820
Provision for loan losses	135	(4)	128	(10)
Consumer Portfolio Segment [Member]
Recoveries	8	11	19	43
Loans charged off	(18)	(11)	(46)	(71)
Balance, end of period	361	275	361	275
Balance, beginning of period	459	280	285	322
Provision for loan losses	$ (88)	$ (5)	$ 103	$ (19)