Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Balance	$ 8,013	$ 7,996	$ 6,728	$ 7,499
Provision for loan losses	(806)	(23)	1,571	733
Loans charged off	(1,163)	(751)	(2,523)	(1,338)
Recoveries	1,357	417	1,625	745
Balance	7,401	7,639	7,401	7,639
Residential Portfolio Segment [Member]
Balance	2,079	2,059	1,583	1,470
Provision for loan losses	(552)	(14)	261	580
Loans charged off	(78)	(177)	(407)	(237)
Recoveries	524	18	536	73
Balance	1,973	1,886	1,973	1,886
Commercial Real Estate Portfolio Segment [Member]
Balance	2,452	2,423	2,186	2,978
Provision for loan losses	(260)	(82)	133	(663)
Loans charged off	(438)		(579)	(1)
Recoveries	468	51	482	78
Balance	2,222	2,392	2,222	2,392
Commercial and Industrial Portfolio Segment [Member]
Balance	1,315	1,373	1,063	1,024
Provision for loan losses	(169)	(317)	304	(1)
Loans charged off	(111)		(344)	(4)
Recoveries	60	186	72	223
Balance	1,095	1,242	1,095	1,242
Consumer Portfolio Segment [Member]
Balance	2,167	2,141	1,896	2,027
Provision for loan losses	175	390	873	817
Loans charged off	(536)	(574)	(1,193)	(1,096)
Recoveries	305	162	535	371
Balance	$ 2,111	$ 2,119	$ 2,111	$ 2,119