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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Balance			$ 6,863	$ 7,390	$ 7,390
Charge-offs			(540)	(508)	(920)
Recoveries			154	167	267
Provision for loan losses	$ 1,352	$ 55	1,831	255	126
Balance	8,308	7,304	8,308	7,304	6,863
Real Estate Construction Portfolio Segment[Member]
Balance			400	398	398
Provision for loan losses			(15)	118	2
Balance	385	516	385	516	400
Consumer Real Estate Portfolio Segment [Member]
Balance			1,895	2,049	2,049
Charge-offs			(62)	(107)	(192)
Recoveries			16
Provision for loan losses			417	124	38
Balance	2,266	2,066	2,266	2,066	1,895
Commercial Real Estate Portfolio Segment [Member]
Balance			2,559	2,798	2,798
Charge-offs			(15)	(150)	(150)
Recoveries			24	24	49
Provision for loan losses			808	288	(138)
Balance	3,376	2,960	3,376	2,960	2,559
Commercial Non Real Estate Segment [Member]
Balance			555	602	602
Charge-offs			(347)		(47)
Recoveries			1		1
Provision for loan losses			457	(123)	(1)
Balance	666	479	666	479	555
Public Sector and IDA Portfolio Segment[Member]
Balance			478	583	583
Provision for loan losses			85	(54)	(105)
Balance	563	529	563	529	478
Consumer Non Real Estate Portfolio Segment [Member]
Balance			650	750	750
Charge-offs			(116)	(251)	(531)
Recoveries			113	143	217
Provision for loan losses			10	29	214
Balance	657	671	657	671	650
Unallocated Financing Receivables [Member]
Balance			326	210	210
Provision for loan losses			69	(127)	116
Balance	$ 395	$ 83	$ 395	$ 83	$ 326