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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Balance			$ 7,390	$ 7,925	$ 7,925
Charge-offs			(508)	(340)	(689)
Recoveries			167	124	235
Provision for loan losses	$ 55	$ 342	255	(130)	(81)
Balance	7,304	7,579	7,304	7,579	7,390
Real Estate Construction Portfolio Segment[Member]
Balance			398	337	337
Charge-offs			0
Recoveries			0	0	0
Provision for loan losses			118	36	61
Balance	516	373	516	373	398
Consumer Real Estate Portfolio Segment [Member]
Balance			2,049	2,027	2,027
Charge-offs			(107)		(38)
Recoveries				2	3
Provision for loan losses			124	(29)	57
Balance	2,066	2,000	2,066	2,000	2,049
Commercial Real Estate Portfolio Segment [Member]
Balance			2,798	3,044	3,044
Charge-offs			(150)
Recoveries			24	25	49
Provision for loan losses			288	(78)	(295)
Balance	2,960	2,991	2,960	2,991	2,798
Commercial Non Real Estate Segment [Member]
Balance			602	1,072	1,072
Charge-offs				(107)	(107)
Recoveries				10	22
Provision for loan losses			(123)	(215)	(385)
Balance	479	760	479	760	602
Public Sector and IDA Portfolio Segment[Member]
Balance			583	419	419
Charge-offs			0	0	0
Recoveries			0	0	0
Provision for loan losses			(54)	154	164
Balance	529	573	529	573	583
Consumer Non Real Estate Portfolio Segment [Member]
Balance			750	707	707
Charge-offs			(251)	(233)	(544)
Recoveries			143	87	161
Provision for loan losses			29	199	426
Balance	671	760	671	760	750
Unallocated Financing Receivables [Member]
Balance			210	319	319
Charge-offs			0	0	0
Recoveries			0	0	0
Provision for loan losses			(127)	(197)	(109)
Balance	$ 83	$ 122	$ 83	$ 122	$ 210