Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Provision for loan losses	$ 464	$ 654	$ 523	$ 857	$ 1,650
Balance	8,372	8,195	8,372	8,195	8,300
Balance			8,300	8,297	8,297
Charge-offs			(552)	(1,051)	(1,806)
Recoveries			101	92	159
Real Estate Construction Portfolio Segment[Member]
Provision for loan losses			(87)	(32)	(109)
Balance	351	515	351	515	438
Balance			438	576	576
Charge-offs			0	(29)	(29)
Recoveries			0	0	0
Consumer Real Estate Portfolio Segment [Member]
Provision for loan losses			340	(2)	95
Balance	2,033	1,776	2,033	1,776	1,830
Balance			1,830	1,866	1,866
Charge-offs			(138)	(89)	(133)
Recoveries			1	1	2
Commercial Real Estate Portfolio Segment [Member]
Provision for loan losses			116	(574)	34
Balance	3,768	3,469	3,768	3,469	3,738
Balance			3,738	4,109	4,109
Charge-offs			(122)	(125)	(488)
Recoveries			36	59	83
Commercial Non Real Estate Segment [Member]
Provision for loan losses			103	1,537	1,281
Balance	1,103	1,485	1,103	1,485	1,063
Balance			1,063	655	655
Charge-offs			(73)	(708)	(883)
Recoveries			10	1	10
Public Sector and IDA Portfolio Segment[Member]
Provision for loan losses			83	(55)	(106)
Balance	413	381	413	381	330
Balance			330	436	436
Charge-offs			0	0	0
Recoveries			0	0	0
Consumer Non Real Estate Portfolio Segment [Member]
Provision for loan losses			218	(3)	226
Balance	697	555	697	555	644
Balance			644	627	627
Charge-offs			(219)	(100)	(273)
Recoveries			54	31	64
Unallocated Financing Receivables [Member]
Provision for loan losses			(250)	(14)	229
Balance	$ 7	$ 14	7	14	257
Balance			257	28	28
Charge-offs			0	0	0
Recoveries			$ 0	$ 0	$ 0